Quantitative Aptitude: Number Series Set 115

Directions: The following number series follow a specific pattern. Find the number which is wrong in the respective series.

  1. 10, 26, 46, 75, 120, 180
    180
    26
    75
    10
    46
    Option A
    10 .. 26 .. 46 .. 75.. 120 190
    + 16 ..20 .. 29 .. 45 .. 70
    + 2*2 3*2 4*2 5*2

     

  2. 20, 36, 56, 64, 124 , 180
    124
    36
    64
    20
    56
    Option C
    20 ..36 .. 56 .. 84.. 124 .. 180

    + 16.. 20.. 28 .. 40 .. 56

    + 4 .. 8 ..12 .. 16

     

  3. 1, 11, 202, 264, 287, 266
    202
    1
    111
    261
    287
    Option D
    1.. 111 .. 202.. 264 .. 287 .. 261

    + 110 .. 91 .. 62.. 23 .. -26

    – 19 .. 29 .. 39 .. 49

     

  4. 5, 7, 13, 23, 61, 133
    23
    5
    7
    61
    233
    Option A
    5 7 13 25 61 133

    + 2 6 12 36 72

    x 3 2 3 2

     

  5. 5, 15, 30, 55, 97, 160
    15
    30
    55
    97
    160
    Option E
    5 15 30 55 97 165

    + 10 15 25 42 68

    + 2*2+1 3*2+1 4*2+1 5*2+1

     

  6. 20, 30, 45, 65, 106, 160
    20
    30
    45
    65
    106
    Option D
    20 30 45 69 106 160

    + 10 15 24 37 54

    + 5 9 13 17

     

  7. 10, 20, 31.5, 45.5, 63, 80
    80
    63
    20
    10
    31.5
    Option A
    10 20 31.5 45.5 63 85

    + 10 11.5 14 17.5 22

    + 1.5 2.5 3.5 4.5

     

  8. 100, 90, 70, 57, -76, -1320
    100
    90
    70
    57
    -76
    Option C
    100 90 79 57 -76 -1320

    – 10 11 22 133 1244

    + 1 11 111 1111

     

  9. 500, 498, 490, 440, 186 ,-1370
    500
    498
    490
    440
    186
    Option D
    500 498 490 446 186 -1370

    – 2 8 44 260 1556

    + 6 6*2 6*3 6*4

     

  10. 10, 26, 41, 53, 60, 70
    70
    60
    53
    26
    10
    Option A
    10 26 41 53 60 60

    + 16 15 12 7 0

    – 1 3 5 7

     

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