Number Series Asked in IBPS PO - VI (Prelim) Exam - 16.10.2016 (4th Shift)

Directions (1-5): What should come in place of the question mark (?) in the following number series? 
1) 22, 10, 8, 12, 40, ?
a) 50
b) 48
c) 304
d) 636
e) 512

2) 6, 14, 39, 160, 795, ?
a) 1005
b) 3776
c) 2569
d) 56
e) 4776

3) 25, 29, 20, 36, 11, ?
a) 47
b) 37
c) 30
d) 74
e) 35

4) 18, 23, 36, 56, 82         ?
a) 103
b) 113
c) 163
d) 96
e) 88

5) 13, 21, 37, 69, ? ,261
a)103
b) 86
c) 134
d) 133
e) 163

Answers:

1. c) 304

Solution:
22 x 0.5 – 1 = 10
10 x 1 (double of 0.5) – 2 (double of 1) = 8
8 x 2 – 4 = 12
12 x 4 – 8 = 40
40 x 8 – 16 = 304

2. e) 4776

Solution:
6 x 2 + 2 = 14
14 x 3 – 3 = 39
39 x 4 + 4 = 160
160 x 5 – 5 = 795
795 x 6 + 6 = 4776

3. a) 47

Solution:
25 + 22 = 29
29 - 32 = 20
20 + 42 = 36
36 - 52 = 11
11 + 62 = 11 + 36 = 47

4. b) 113

Solution:

5. d) 133

Solution:
13 x 2 - 5 = 21
21 x 2 - 5 = 37
37 x 2 - 5 = 69
69 x 2 - 5 = 133
133 x 2 - 5 = 261

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