# 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