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

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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