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