# Quantitative Aptitude: Number Series Set 133

Directions: The following number series are based on a certain pattern. One number out of all is incorrect and does not follow the pattern. Find that odd one out.

1. 1000, 995, 999,9 80, 950, 830
1000
995
999
980
950
Option C
1000 .. 995 .. 990 .. 980 .. 950 830

– 5 .. 5 .. 10 .. 30 .. 120

….x 1 .. 2 .. 3 .. 4

2. 20, 25, 31.1, 38.4, 40, 57
20
25
40
57
31.1
Option C
20 …. 25 …. 31.1 …. 38.4 …. 47 …. 57

……+ 5 …. 6.1 …. 7.3 …. 8.6 …… 10

………. + 1.1 …. 1.2 …. 1.3…. 1.4

3. 200, 184,164, 135, 90, 40
200
184
164
90
20
Option E
200 184 164 135 90 20

– 16 20 29 45 70

+ 2^2 3^2 4^2 5^2

4. 1, 1, 5, 70, 2000, 115500
1
5
70
2000
115500
Option D
1 1 5 70 2100 115500

x 1 5 14 30 55

+ 2^2 3^2 4^2 5^2

5. 15, 25, 36, 52, 70, 115
15
25
36
52
70
Option E
15 25 36 52 77 115

+ 10 11 16 25 38

+ 1 5 9 13

6. 30, 31, 36, 41, 56, 87
30
31
36
41
56
Option C
30 31 34 41 56 87

+ 1 3 7 15 31

+ 2^1 2^2 2^3 2^4

7. 300, 245 , 190, 160, 150, 175
300
245
190
160
150
Option C
300 245 195 160 150 175

– 55 50 35 10 -25

-5 15 25 35

8. 10, 13, 21, 47, 84, 155
10
13
21
47
84
Option D
10 13 21 42 84 155

+ 3 8 21 42 71

+ 5 13 21 29

+ 8 8 8

9. 20, 24.5, 30.5, 39.5, 53.5 , 72.5
53
20
30.5
24.5
39.5
Option A
20 24.5 30.5 39.5 53 72.5

+ 4.5 6 9 13.5 19.5

+1. 5 3 4.5 6

+ 1.5 1.5 1.5

10. 14, 34, 64 , 124, 262
14
34
64
124
262
Option D
+ 14 34 64 122 262

+ 20 3 0 58 140

+ 1+3^2 1+3^3 1+3^4