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Aptitude Questions: Number Series Set 20

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Hello Aspirants. Welcome to Online Quantitative Aptitude Section in AffairsCloud.com. Here we are creating question sample in Number Series, which is common for all the competitive exams. We have included Some questions that are repeatedly asked in bank exams !!!

  1. 686, 438, 314, 252, 221, ?
    A) 180
    B) 187.5
    C) 201
    D) 205.5
    E) 175.5
    D) 205.5
    Explanation:

    686 – 248 = 438
    438 – (248/2) = 438 – 124 = 314
    314 – (124/2) = 314 – 62 = 252
    252 – (62/2) = 252 – 31 = 221

  2. 427, 85.4, 34.16, 20.496, ?
    A) 14.3782
    B) 16.2902
    C) 16.3968
    D) 20.3984
    E) 11.6248
    C) 16.3968
    Explanation:

    *0.2, *0.4, *0.6, *0.8

  3. 6, 6, 4, 8, 3.2, 9.6, ?
    A) 5.4
    B) 2.8
    C) 2.5
    D) 4.1
    E) None of these
    B) 2.8
    Explanation:

    *1, ÷1.5, *2, ÷2.5, *3, ÷3.5

  4. 4.2, 2.6, 2.1, 1.3, 1.05, 0.65, 0.525, ?
    A) 0.315
    B) 0.325
    C) 0.435
    D) 0.465
    E) 0.535
    B) 0.325
    Explanation:

    It is a double series:
    ÷0.5 :– 4.2, 2.1, 1.05, 0.525
    ÷0.5 :– 2.6, 1.3, 0.65, ?

  5. 5, 9, 36, 208, 1398, ?
    A) 7392
    B) 14378
    C) 12542
    D) 6448
    E) 11472
    E) 11472
    Explanation:

    [5+22] × 1 = 9
    [9+32] × 2 = 36
    [36+42] × 4 = 208
    [208+52] × 6 = 1398
    [1398+62] × 8 = 11472

  6. 4, 3, 12, 6, 36, 9, 108, 12, ?
    A) 324
    B) 252
    C) 156
    D) 182
    E) 236
    A) 324
    Explanation:

    It is a double series.
    *3 :– 4, 12, 36, 108
    +3 :– 3, 6, 9, 12

  7. 2, 7, 29, 85, 192, ?
    A) 385
    B) 213
    C) 264
    D) 367
    E) None of these
    D) 367
    Explanation:

    It is a double difference series:
    7-2 = 5, 29-7 = 22, 85-29 = 56, 192-85 = 107
    22-5 = 17, 56-22 = 34, 107-56 = 51
    So next [(51+17)+107]+192

  8. 15, 27, 44, 66, 93, ?
    A) 136
    B) 125
    C) 154
    D) 165
    E) 193
    B) 125
    Explanation:

    15 + 12 = 27
    27 + (12+5) = 27 + 17 = 44
    44 + (17+5) = 44 + 22 = 66
    66 + (22+5) = 93

  9. 120, 170, 224, 280, 360, ?
    A) 392
    B) 442
    C) 458
    D) 528
    E) 540
    B) 442
    Explanation:

    11^2 – 1 = 120
    13^2 + 1 = 170
    15^2 – 1 = 224
    17^2 + 1 = 280
    19^2 – 1 = 360
    21^2 + 1 = 442

  10. 9, 9, 18, 54, 162, 324, ?
    A) 428
    B) 404
    C) 386
    D) 422
    E) None of these
    E) None of these
    Explanation:

    *1, *2, *3, *3, *2, *1