Quantitative Aptitude: Number Series Set 3

Directions: The following series are based on a specific pattern. In these series one number is wrong, find that odd one.

  1. 7, 23, 57, 109, 191, 307
    A) 191
    B) 307
    C) 109
    D) 57
    E) 23
    View Answer
    Option D
    Pattern:

    23 – 12, 33 – 22, 43 – 32, 53 – 42, ….
  2. 128, 72, 96, 240, 840, 3780
    A) 96
    B) 72
    C) 240
    D) 3780
    E) 840
    View Answer
    Option B
    Pattern:

    112×0.5, 56×1.5, 84×2.5, 210×3.5,
  3. 145, 170, 195, 224, 252, 290
    A) 224
    B) 170
    C) 252
    D) 195
    E) 290
    View Answer
    Option C
    Pattern:

    122+1, 132+1, 142-1, 152-1, 162+1,
  4. 23, 12, 13, 21, 44, 170, 340.5
    A) 12
    B) 13
    C) 21
    D) 44
    E) 170
    View Answer
    Option E
    Pattern:

    11*0.5 + 0.5, 6*1 + 1, 7*1.5 + 1.5, 12*2 + 2, 26*2.5 + 2.5
  5. 4, 5, 11, 39, 175, 1127, 7881
    A) 1127
    B) 175
    C) 5
    D) 11
    E) 39
    View Answer
    Option B
    Pattern:

    ×2 – 3, ×3 – 4, ×4 – 5, ×5 – 6, ×6 – 7
  6. 6, 9, 30, 90, 432, 2520
    A) 9
    B) 432
    C) 90
    D) 30
    E) 2520
    View Answer
    Option D
    Pattern:

    6×2 – 6/2, 9×3 – 9/3, 24×4 – 24/4, 90×5 – 90/5, 432×6 – 432/6
  7. 10, 6, 14, 9, 32, 16, 80
    A) 9
    B) 14
    C) 6
    D) 32
    E) 16
    View Answer
    Option B
    Pattern:

    – 22, + 23, – 32, + 33, – 42,
  8. 5760, 352, 40, 8, 6.5, 2.5
    A) 8
    B) 6.5
    C) 40
    D) 352
    E) 2.5
    View Answer
    Option B
    Pattern:

    5760/16 – 16/2 = 352
    352/8 – 8/2 = 40
    40/4 – 4/2 = 8
    8/2 – 2/2 = 3
    3/1 – 1/2 = 2.5
  9. 6, 9, 23, 55, 92, 151, 229
    A) 151
    B) 92
    C) 55
    D) 23
    E) 229
    View Answer
    Option C
    Pattern:

  10. 8, 2, 2, 4.5, 25, 112.5, 1012.5
    A) 1012.5
    B) 112.5
    C) 4.5
    D) 25
    E) None of these
    View Answer
    Option D
    Pattern:

    × 0.52, × 12, × 1.52, × 22, × 2.52

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