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Quantitative Aptitude: Number Series Set 20

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Directions: What will come in place of (?) in the following number series?

  1. 3, 7, 12.2, 19.8, 31, ?
    A) 65.5
    B) 47
    C) 56
    D) 44.4
    E) 56.5
    View Answer
    Option B
    Pattern:
    3…………7…………12.2…………..19.8…………..31………….47
    ……+4 +5.2            +7.6…………….+11.2………+16
    ………..+1.2           +2.4           +3.6                 +4.8
  2. 5, 17, 34, 41, 63, ?
    A) 79
    B) 74
    C) 72
    D) 68
    E) 65
    View Answer
    Option E
    Pattern:
    5………….17………34………41………….63………..65
    …….+12        +17       +7          +22            2
    .             +5         -10       +15           -20
  3. 6, 3, 5, 14, 64, ?
    A) 472
    B) 506
    C) 528
    D) 420
    E) 588
    View Answer
    Option C
    Pattern:
    6×0.5 + 0 = 3
    3×1 + 2 = 5
    5×2 + 4 = 14
    14×4 + 8 = 64
    64×8 + 16 = 528
  4. 6, 7, 12, 39, 152, ?
    A) 765
    B) 823
    C) 685
    D) 515
    E) 845
    View Answer
    Option A
    Pattern:
    *1 + 1, *2 – 2, *3 + 3, *4 – 4, *5 + 5
  5. 3, 12, 55, 216, 645, ?
    A) 1355
    B) 1502
    C) 1406
    D) 1288
    E) 1429
    View Answer
    Option D
    Pattern:
    *6 – 6, *5 – 5, *4 – 4, *3 – 3, *2 – 2
  6. 6, 12, 22, 41, 76, ?
    A) 126
    B) 136
    C) 167
    D) 142
    E) 132
    View Answer
    Option B
    Pattern:
    6………. 12……….. 22…………. 41………. 76……….. 136
    . +6            +10         +19        +35          +60
    .           +22           +32         +42          +52
  7. 6, 4, 5, 11, ?, 189
    A) 49
    B) 43
    C) 39
    D) 57
    E) 52
    View Answer
    Option C
    Pattern:
    6*1 – 2, 4*2 – 3, 5*3 – 4, 11*4 – 5, 39*5 – 6
  8. 5, 1, 3, 9, 31, ?
    A) 104
    B) 136
    C) 154
    D) 129
    E) 144
    View Answer
    Option D
    Pattern:
    ×0+ 1, ×1 + 2,  ×2 + 3,  ×3 + 4, ×4 + 5
  9. 5, 7, 25, 131, 925, ?
    A) 8335
    B) 7340
    C) 6460
    D) 7520
    E) 9420
    View Answer
    Option A
    Pattern:
    ×1 + 2, ×3 + 4, ×5 + 6, ×7 + 8, ×9 + 10.
  10. 4, 9, 20, 43, ?, 185
    A) 82
    B) 90
    C) 73
    D) 62
    E) 96
    View Answer
    Option B
    Pattern:
    4×2 + 1 = 9,
    9×2 + 2 = 20,
    20×2 + 3 = 43,
    43×2 + 4 = 90,
    90×2 + 5 = 185  

 

 

 

 

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