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Number & Letter Series MCQ Practice

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481. Select the number that can replace the question mark(?) in the following series. 63,82,102,123,145,?
  1. A. 167
  2. B. 178
  3. C. 168
  4. D. 159
Answer: 168
Explanation: First differences are [19, 20, 21, 22] (increasing by +1 each step); next difference is +23, so 145 + (23) = 168.
Share Link #q481
482. Select the number that can replace the question mark(?) in the following series. 16,17,23,18,19,26,20,21,29,22,?,?
  1. A. 23,32
  2. B. 25,36
  3. C. 32,23
  4. D. 36,25
Answer: 23,32
Explanation: Following the sequential progression rule of the given series, option (c) '32,23' correctly replaces the question mark (?).
Share Link #q482
483. Select the correct alternative from the given ones that will complete the series. ROD, XUJ, DAP, JGV ,?
  1. A. QNC
  2. B. PNB
  3. C. PMB
  4. D. QMB
Answer: PMB
Explanation: In the letter series ROD, XUJ, DAP, JGV, each term advances by (+6, +6, +6) in alphabetical position, giving 'PMB'.
Share Link #q483
484. Select the number that can replace the question mark (?) in the following series. 3, 7, 22, 89, ?
  1. A. 452
  2. B. 446
  3. C. 440
  4. D. 448
Answer: 446
Explanation: Following the sequential progression rule of the given series, option (b) '446' correctly replaces the question mark (?).
Share Link #q484
485. A series is given with one term missing. Select the correct alternative form the given ones that will complete the series. ML, RQ, WV , BA, ?
  1. A. GE
  2. B. GF
  3. C. HF
  4. D. HE
Answer: GF
Explanation: In the letter series ML, RQ, WV, BA, each term advances by (+5, +5) in alphabetical position, giving 'GF'.
Share Link #q485
486. Select the number that can replace the question mark (?) in the following series. 307, 303, 299, 295, ?
  1. A. 287
  2. B. 293
  3. C. 289
  4. D. 291
Answer: 291
Explanation: Series pattern: Constant difference of -4 between consecutive terms (295 + (-4) = 291).
Share Link #q486
487. Select the number that can replace the question mark (?) in the following series. 279, 277, 273, 267, ?
  1. A. 259
  2. B. 263
  3. C. 261
  4. D. 257
Answer: 259
Explanation: First differences are [-2, -4, -6] (increasing by -2 each step); next difference is -8, so 267 + (-8) = 259.
Share Link #q487
488. Select the letter-pair that can replace the question mark (?) in the following series. MR, NU, OX, PA, ?
  1. A. RE
  2. B. QC
  3. C. RC
  4. D. QD
Answer: QD
Explanation: In the letter series MR, NU, OX, PA, each term advances by (+1, +3) in alphabetical position, giving 'QD'.
Share Link #q488
489. Select the number that can replace the question mark (?) in the following series. 8, 8, 16, 48, ?
  1. A. 216
  2. B. 190
  3. C. 196
  4. D. 192
Answer: 192
Explanation: Following the sequential progression rule of the given series, option (a) '216' correctly replaces the question mark (?).
Share Link #q489
490. Select the letter-cluster that can replace the question mark (?) in the following series. RAB, TDG, VGL, ?,ZMV
  1. A. XJQ
  2. B. YLR
  3. C. XKQ
  4. D. YKR
Answer: XJQ
Explanation: Following the sequential progression rule of the given series, option (c) 'XKQ' correctly replaces the question mark (?).
Share Link #q490
491. Select the number that can replace the question mark (?) in the following series. 37, 33, 29, 25 ?
  1. A. 19
  2. B. 21
  3. C. 20
  4. D. 22
Answer: 21
Explanation: Series pattern: Constant difference of -4 between consecutive terms (25 + (-4) = 21).
Share Link #q491
492. Select the number that can replace the question mark (?) in the following series. 72,69,64,?,48
  1. A. 57
  2. B. 54
  3. C. 59
  4. D. 55
Answer: 57
Explanation: Following the sequential progression rule of the given series, option (b) '54' correctly replaces the question mark (?).
Share Link #q492
493. Select the letter-cluster that can replace the question mark (?) in the following series. MRT, TYA, AFH, HMO, ?
  1. A. PUV
  2. B. PUU
  3. C. OTV
  4. D. OTU
Answer: OTV
Explanation: In the letter series MRT, TYA, AFH, HMO, each term advances by (+7, +7, +7) in alphabetical position, giving 'OTV'.
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494. Select the numbers that can replace the question marks (?) in the following series. 36, 49, 51, 39, 53, 54, 42, 57, 57, 45, ?, ?
  1. A. 71, 60
  2. B. 60, 63
  3. C. 60, 61
  4. D. 61, 60
Answer: 61, 60
Explanation: Following the sequential progression rule of the given series, option (c) '60, 61' correctly replaces the question mark (?).
Share Link #q494
495. Select the number that can replace the question mark (?) in the following series. 13, 17, 19, 23, 29, ?
  1. A. 41
  2. B. 43
  3. C. 37
  4. D. 31
Answer: 31
Explanation: Following the sequential progression rule of the given series, option (a) '41' correctly replaces the question mark (?).
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496. Select the number that can replace the question mark (?) in the following series. 5, 10, 17, 26, 37, ?
  1. A. 47
  2. B. 50
  3. C. 48
  4. D. 49
Answer: 50
Explanation: First differences are [5, 7, 9, 11] (increasing by +2 each step); next difference is +13, so 37 + (13) = 50.
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497. Select the letter-cluster that can replace the question mark (?) in the following series. RAP, SCS, TEV , UGY ,?
  1. A. VJB
  2. B. WJB
  3. C. WJC
  4. D. VIB
Answer: VIB
Explanation: In the letter series RAP, SCS, TEV, UGY, each term advances by (+1, +2, +3) in alphabetical position, giving 'VIB'.
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498. Select the number that can replace the question mark (?) in the following series. 137, 148, 161, 176, 193, ?
  1. A. 232
  2. B. 214
  3. C. 224
  4. D. 212
Answer: 212
Explanation: First differences are [11, 13, 15, 17] (increasing by +2 each step); next difference is +19, so 193 + (19) = 212.
Share Link #q498
499. Select the letter-pair that can replace the question mark(?) in the following series. KP, HM, EJ, BG, ?
  1. A. YD
  2. B. ZE
  3. C. YC
  4. D. XC
Answer: YD
Explanation: In the letter series KP, HM, EJ, BG, each term advances by (-3, -3) in alphabetical position, giving 'YD'.
Share Link #q499
500. Select the number that can replace the question mark (?) in the following series. 43,31,74,105,179,?
  1. A. 263
  2. B. 279
  3. C. 294
  4. D. 284
Answer: 284
Explanation: Following the sequential progression rule of the given series, option (c) '294' correctly replaces the question mark (?).
Share Link #q500
501. Select the number that can replace the question mark (?) in the following series. 69,109,159,219,289,?
  1. A. 349
  2. B. 369
  3. C. 379
  4. D. 359
Answer: 369
Explanation: First differences are [40, 50, 60, 70] (increasing by +10 each step); next difference is +80, so 289 + (80) = 369.
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502. Select the letter-pair that can replace the question mark (?) in the following series. AR, CU, EX, GA, ?
  1. A. JE
  2. B. ID
  3. C. IF
  4. D. KF
Answer: ID
Explanation: In the letter series AR, CU, EX, GA, each term advances by (+2, +3) in alphabetical position, giving 'ID'.
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503. Select the number that can replace the question mark (?) in the following series. 31, 44, 58, 73, 89, ?
  1. A. 105
  2. B. 106
  3. C. 115
  4. D. 116
Answer: 106
Explanation: First differences are [13, 14, 15, 16] (increasing by +1 each step); next difference is +17, so 89 + (17) = 106.
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504. Select the number that can replace the question mark (?) in the following series. 16, 20, 29, 45, 70, ?
  1. A. 106
  2. B. 116
  3. C. 96
  4. D. 126
Answer: 106
Explanation: Following the sequential progression rule of the given series, option (d) '126' correctly replaces the question mark (?).
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505. Which letter-pair will replace the question mark (?) in the following series ? KH, ? , QN, WT, EB
  1. A. NJ
  2. B. MJ
  3. C. LN
  4. D. MK
Answer: MJ
Explanation: Following the sequential progression rule of the given series, option (d) 'MK' correctly replaces the question mark (?).
Share Link #q505
506. Which number will replace the question mark (?) in the following series? 2, 3, 8, 31, ?
  1. A. 154
  2. B. 134
  3. C. 105
  4. D. 95
Answer: 154
Explanation: Following the sequential progression rule of the given series, option (a) '154' correctly replaces the question mark (?).
Share Link #q506
507. Which letter-pair will replace the question mark (?) in the following series? EI, GK, ? , KO, MQ
  1. A. IL
  2. B. KM
  3. C. IM
  4. D. JK
Answer: IM
Explanation: Following the sequential progression rule of the given series, option (c) 'IM' correctly replaces the question mark (?).
Share Link #q507
508. Which number will replace the question mark (?) in the following series? 7, 9, 12, 17, 24, 35, ?
  1. A. 52
  2. B. 45
  3. C. 47
  4. D. 48
Answer: 48
Explanation: Following the sequential progression rule of the given series, option (b) '45' correctly replaces the question mark (?).
Share Link #q508
509. Which number will replace the question mark (?) in the following series? 2, 4, 7, 12, 19, 30, ?
  1. A. 47
  2. B. 38
  3. C. 43
  4. D. 36
Answer: 43
Explanation: Following the sequential progression rule of the given series, option (a) '47' correctly replaces the question mark (?).
Share Link #q509
510. Which letter-pair will replace the question mark (?) in the following series ? FJ, HL, ? , LP, NR
  1. A. JM
  2. B. JN
  3. C. GM
  4. D. IN
Answer: JN
Explanation: Following the sequential progression rule of the given series, option (b) 'JN' correctly replaces the question mark (?).
Share Link #q510
511. Which number will replace the question mark (?) in the following series? 6 , 12 , 36 , 144 , ?
  1. A. 720
  2. B. 520
  3. C. 620
  4. D. 420
Answer: 720
Explanation: Following the sequential progression rule of the given series, option (b) '520' correctly replaces the question mark (?).
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512. Which number will replace the question mark (?) in the following series? 12, 22, 42, 72, ?
  1. A. 102
  2. B. 92
  3. C. 122
  4. D. 112
Answer: 112
Explanation: First differences are [10, 20, 30] (increasing by +10 each step); next difference is +40, so 72 + (40) = 112.
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513. Which letter-pair will replace the question mark (?) in the following series? HE , ? , NK, TQ, BY
  1. A. IK
  2. B. JG
  3. C. JH
  4. D. IG
Answer: JG
Explanation: Following the sequential progression rule of the given series, option (c) 'JH' correctly replaces the question mark (?).
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514. Which number will replace the question mark (?) in the following series? 1, 2, 6, 24, 120, ?
  1. A. 240
  2. B. 570
  3. C. 720
  4. D. 360
Answer: 720
Explanation: Following the sequential progression rule of the given series, option (b) '570' correctly replaces the question mark (?).
Share Link #q514
515. Which number will replace the question mark (?) in the following series? 6, 10, 26, 62, ?
  1. A. 92
  2. B. 126
  3. C. 216
  4. D. 112
Answer: 126
Explanation: Following the sequential progression rule of the given series, option (d) '112' correctly replaces the question mark (?).
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516. Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series. OL, QO, __, UU, WX
  1. A. ST
  2. B. RS
  3. C. SU
  4. D. SR
Answer: SR
Explanation: Following the sequential progression rule of the given series, option (a) 'ST' correctly replaces the question mark (?).
Share Link #q516
517. Which number will replace the question mark (?) in the following series? 6, 7, 11, 20, ?
  1. A. 29
  2. B. 32
  3. C. 35
  4. D. 36
Answer: 36
Explanation: Following the sequential progression rule of the given series, option (a) '29' correctly replaces the question mark (?).
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518. Which letter-pair will replace the question mark (?) in the following series? BE, DG, FK, HQ, ?
  1. A. JY
  2. B. JX
  3. C. JS
  4. D. YJ
Answer: JY
Explanation: Following the sequential progression rule of the given series, option (c) 'JS' correctly replaces the question mark (?).
Share Link #q518
519. Which number will replace the question mark (?) in the following series? 52, 54, 57, 62, 69, ?
  1. A. 90
  2. B. 95
  3. C. 80
  4. D. 85
Answer: 80
Explanation: Following the sequential progression rule of the given series, option (d) '85' correctly replaces the question mark (?).
Share Link #q519
520. Which number will replace the question mark (?) in the following series ? 77, 92, 125, 178, 253, ?
  1. A. 350
  2. B. 352
  3. C. 353
  4. D. 351
Answer: 352
Explanation: Following the sequential progression rule of the given series, option (b) '352' correctly replaces the question mark (?).
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521. Which number will replace the question mark (?) in the following series? 55, 56, 64, 91, 155, ?
  1. A. 265
  2. B. 275
  3. C. 280
  4. D. 270
Answer: 280
Explanation: Following the sequential progression rule of the given series, option (d) '270' correctly replaces the question mark (?).
Share Link #q521
522. Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series. t s m _ _ n q _ _ s m m n _ _ s t _ m m n _ q s
  1. A. mnstnqmn
  2. B. mmstmqtn
  3. C. mnstnqsn
  4. D. nmstnqns
Answer: mnstnqsn
Explanation: Following the sequential progression rule of the given series, option (a) 'mnstnqmn' correctly replaces the question mark (?).
Share Link #q522
523. Which number will replace the question mark(?) in the following series? 25, 42, 67, 101, 145, ?
  1. A. 200
  2. B. 199
  3. C. 201
  4. D. 202
Answer: 200
Explanation: Following the sequential progression rule of the given series, option (c) '201' correctly replaces the question mark (?).
Share Link #q523
524. Which number will replace the question mark (?) in the following series? 28,32,41,57,82,?
  1. A. 120
  2. B. 118
  3. C. 116
  4. D. 122
Answer: 118
Explanation: Following the sequential progression rule of the given series, option (d) '122' correctly replaces the question mark (?).
Share Link #q524
525. Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series. xq _ _ m c c _ _ q p f m _ _ b x_ _ f m c _ b
  1. A. pfbxccqpc
  2. B. sfbcccqpc
  3. C. qfbxccqpc
  4. D. pfbxcxqpc
Answer: pfbxccqpc
Explanation: Following the sequential progression rule of the given series, option (d) 'pfbxcxqpc' correctly replaces the question mark (?).
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526. Which number will replace the question mark (?) in the following series? 20,10,10,15,30,?
  1. A. 45
  2. B. 90
  3. C. 60
  4. D. 75
Answer: 75
Explanation: Following the sequential progression rule of the given series, option (d) '75' correctly replaces the question mark (?).
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527. Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series. g _ k m _ s k m _ g k m _ s k m g g k _ p s _ m
  1. A. gspgkm
  2. B. gpgpmk
  3. C. gpgskm
  4. D. gpgpkm
Answer: gpgpmk
Explanation: Following the sequential progression rule of the given series, option (b) 'gpgpmk' correctly replaces the question mark (?).
Share Link #q527
528. Which number will replace the question mark (?) in the following series? 16, 18, 21, 26, 33, ?
  1. A. 46
  2. B. 44
  3. C. 45
  4. D. 43
Answer: 44
Explanation: Following the sequential progression rule of the given series, option (a) '46' correctly replaces the question mark (?).
Share Link #q528
529. Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series. s_ _m r q c t_p d m _ q _ t s _ _ m r q c t
  1. A. pdsrcrd
  2. B. pdsrcpd
  3. C. rdsrcrd
  4. D. pdsrbpd
Answer: pdsrcpd
Explanation: Following the sequential progression rule of the given series, option (b) 'pdsrcpd' correctly replaces the question mark (?).
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530. Select the letter cluster that will come next in the following series. LVD, OTF, RRH, ?, XNL
  1. A. UQI
  2. B. TPJ
  3. C. TQJ
  4. D. UPJ
Answer: UPJ
Explanation: Following the sequential progression rule of the given series, option (c) 'TQJ' correctly replaces the question mark (?).
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531. Which number will replace the question mark (?) in the following series? 4, 16, 36, 64, 100, 144, 196, ?
  1. A. 256
  2. B. 284
  3. C. 225
  4. D. 246
Answer: 256
Explanation: First differences are [12, 20, 28, 36, 44, 52] (increasing by +8 each step); next difference is +60, so 196 + (60) = 256.
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532. Select the number that will come next in the following series. 2, 6, 14, 30, 62, ?
  1. A. 122
  2. B. 98
  3. C. 134
  4. D. 126
Answer: 126
Explanation: Following the sequential progression rule of the given series, option (c) '134' correctly replaces the question mark (?).
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533. Select the term that will come next in the following series. FBA, IGE, LLI, OQM, ?
  1. A. RVQ
  2. B. QVQ
  3. C. RVP
  4. D. RUP
Answer: RVQ
Explanation: In the letter series FBA, IGE, LLI, OQM, each term advances by (+3, +5, +4) in alphabetical position, giving 'RVQ'.
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534. Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series. U _ _ R P K Q _ U K D _ P K _ R _ K D R _ K _ R
  1. A. KQPRQUPQ
  2. B. KDRRUURQ
  3. C. KDRRQUPQ
  4. D. KDRRQPPR
Answer: KDRRQUPQ
Explanation: Following the sequential progression rule of the given series, option (c) 'KDRRQUPQ' correctly replaces the question mark (?).
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535. Which number will replace the question mark (?) in the following series ? 7, 11, ?, 31, 47
  1. A. 29
  2. B. 55
  3. C. 5
  4. D. 19
Answer: 19
Explanation: Following the sequential progression rule of the given series, option (d) '19' correctly replaces the question mark (?).
Share Link #q535
536. Which number will replace the question mark (?) in the following series ? 15, 43, 83, 137, 207, ?
  1. A. 297
  2. B. 292
  3. C. 295
  4. D. 294
Answer: 295
Explanation: Following the sequential progression rule of the given series, option (d) '294' correctly replaces the question mark (?).
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537. Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series. T C _ M B C _ N T _ Q M _ C D _ T _ Q M B _ D N
  1. A. TDCBNCD
  2. B. QDDBCCN
  3. C. QDCBNCC
  4. D. QBCDNNC
Answer: QDCBNCC
Explanation: Following the sequential progression rule of the given series, option (b) 'QDDBCCN' correctly replaces the question mark (?).
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538. Select the letter-cluster that will come next in the following series. DOP , FPN , HQL , JRJ , ?
  1. A. LSH
  2. B. LSI
  3. C. KSH
  4. D. KTI
Answer: LSH
Explanation: In the letter series DOP, FPN, HQL, JRJ, each term advances by (+2, +1, -2) in alphabetical position, giving 'LSH'.
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539. Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series. H_ _E P C K_ _ C D E P _ K F H C _ E P C_F
  1. A. DCFHFDD
  2. B. CDHHDCK
  3. C. CDFHCDK
  4. D. CCFHKDK
Answer: CDFHCDK
Explanation: Following the sequential progression rule of the given series, option (b) 'CDHHDCK' correctly replaces the question mark (?).
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540. Select the term that will come next in the following series. JVD , MTF , PRH , ? , VNL
  1. A. RPJ
  2. B. SPJ
  3. C. SQJ
  4. D. RQI
Answer: SPJ
Explanation: Following the sequential progression rule of the given series, option (b) 'SPJ' correctly replaces the question mark (?).
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541. Which number will replace the question mark (?) in the following series? 16 , 30 , 62 , 122 , 246 , ?
  1. A. 490
  2. B. 488
  3. C. 492
  4. D. 494
Answer: 490
Explanation: Following the sequential progression rule of the given series, option (d) '494' correctly replaces the question mark (?).
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542. Select the term that will come next in the following series. 6 , 24 , 60 , 120 , ?
  1. A. 216
  2. B. 240
  3. C. 210
  4. D. 186
Answer: 210
Explanation: Following the sequential progression rule of the given series, option (d) '186' correctly replaces the question mark (?).
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543. Select the combination of letters which when placed sequentially in the given letter gaps will complete the letters. _ _ Q D P C _ _ Q C Q _ _ C P D Q C _ D P _ P D
  1. A. QCPCPPQC
  2. B. PCPDDPDC
  3. C. QCDDDPQD
  4. D. QCPDDPQC
Answer: QCPDDPQC
Explanation: Following the sequential progression rule of the given series, option (a) 'QCPCPPQC' correctly replaces the question mark (?).
Share Link #q543
544. Which number will replace the question mark (?) in the following series? 3, 14, 29, 38, 51, 58, 69, ?
  1. A. 74
  2. B. 37
  3. C. 73
  4. D. 47
Answer: 74
Explanation: Following the sequential progression rule of the given series, option (d) '47' correctly replaces the question mark (?).
Share Link #q544
545. Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series. a_b_aad_ca_dbc_adb_a
  1. A. dcabca
  2. B. dbcaca
  3. C. dcbaac
  4. D. dcabac
Answer: dcbaac
Explanation: Following the sequential progression rule of the given series, option (c) 'dcbaac' correctly replaces the question mark (?).
Share Link #q545
546. Which number will replace the question mark (?) in the following series? 89 , 90 , 82 , 109 , 45 , ?
  1. A. -80
  2. B. 125
  3. C. 170
  4. D. 109
Answer: 170
Explanation: Following the sequential progression rule of the given series, option (c) '170' correctly replaces the question mark (?).
Share Link #q546
547. Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series. ab_ba_db_bd_ac_ba_db_cdbabd_
  1. A. dcadbbab
  2. B. dcabdbab
  3. C. cdabdbba
  4. D. dcdabbab
Answer: dcabdbab
Explanation: Following the sequential progression rule of the given series, option (c) 'cdabdbba' correctly replaces the question mark (?).
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548. Which number will replace the question mark (?) in the following series ? 2 , 4 , 16 , 52 , 132 , 282 , ?
  1. A. 512
  2. B. 527
  3. C. 534
  4. D. 572
Answer: 534
Explanation: Following the sequential progression rule of the given series, option (b) '527' correctly replaces the question mark (?).
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549. Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series. ab_bcab_b_ab_bcab_bc
  1. A. dcdcd
  2. B. ccdcc
  3. C. ddcdd
  4. D. cdcdc
Answer: ddcdd
Explanation: Following the sequential progression rule of the given series, option (c) 'ddcdd' correctly replaces the question mark (?).
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550. Select the term that will come next in the following series. 3 , 27 , 243 , 2187 , ?
  1. A. 27139
  2. B. 13561
  3. C. 21377
  4. D. 19683
Answer: 19683
Explanation: Following the sequential progression rule of the given series, option (a) '27139' correctly replaces the question mark (?).
Share Link #q550
551. Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series. ab_ba_babd_acb_bdba_b
  1. A. cdabc
  2. B. dcbac
  3. C. acbcd
  4. D. dcabc
Answer: dcbac
Explanation: Following the sequential progression rule of the given series, option (a) 'cdabc' correctly replaces the question mark (?).
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552. Which number will replace the question mark (?) in the following series ? 5 , 9 , 18 , 43 , 92 , 213 , 382 , ?
  1. A. 328
  2. B. 617
  3. C. 382
  4. D. 671
Answer: 671
Explanation: Following the sequential progression rule of the given series, option (d) '671' correctly replaces the question mark (?).
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553. Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series. abc_dab_ _d_b_cdab_c_
  1. A. cacacdc
  2. B. acacdcc
  3. C. ccaacdc
  4. D. cccaccd
Answer: cccaccd
Explanation: Following the sequential progression rule of the given series, option (a) 'cacacdc' correctly replaces the question mark (?).
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554. Which number will replace the question mark (?) in the following series? 5 , 8 , 20 , 34 , 76 , 142 , ?
  1. A. 284
  2. B. 302
  3. C. 296
  4. D. 272
Answer: 296
Explanation: Following the sequential progression rule of the given series, option (a) '284' correctly replaces the question mark (?).
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555. Select the option that will fill in the blank and complete the given series. 0 , 7 , 26 , 63 , 124 , 215 , 342 , 511 , 728 , ____
  1. A. 996
  2. B. 1001
  3. C. 999
  4. D. 1000
Answer: 999
Explanation: Following the sequential progression rule of the given series, option (a) '996' correctly replaces the question mark (?).
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556. Select the term that will come next in the following series. 11 , 13 , 17 , 23 , 31 , 41 , 53 , 67 , 83 , ?
  1. A. 101
  2. B. 97
  3. C. 110
  4. D. 100
Answer: 101
Explanation: First differences are [2, 4, 6, 8, 10, 12, 14, 16] (increasing by +2 each step); next difference is +18, so 83 + (18) = 101.
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557. Select the option that will fill in the blanks and complete the given series. 2, 5, 10, 17, 26, 37, ____ , 65, 82, 101
  1. A. 54
  2. B. 48
  3. C. 50
  4. D. 51
Answer: 50
Explanation: Following the sequential progression rule of the given series, option (c) '50' correctly replaces the question mark (?).
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558. Select the term that will come next in the following series. M , E , P , H , S , ? , V , N
  1. A. U
  2. B. K
  3. C. M
  4. D. J
Answer: K
Explanation: Following the sequential progression rule of the given series, option (d) 'J' correctly replaces the question mark (?).
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559. Select the term that will come next in the following series. DGJ , BDN , ZAR , XXV , ?
  1. A. VUZ
  2. B. UUZ
  3. C. VUY
  4. D. VTZ
Answer: VUZ
Explanation: In the letter series DGJ, BDN, ZAR, XXV, each term advances by (-2, -3, +4) in alphabetical position, giving 'VUZ'.
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560. Select the term that will come next in the following series. 114 , 127 , 153 , 192 , 244 , ?
  1. A. 309
  2. B. 361
  3. C. 344
  4. D. 284
Answer: 309
Explanation: First differences are [13, 26, 39, 52] (increasing by +13 each step); next difference is +65, so 244 + (65) = 309.
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