Number Series Asked in IBPS PO - VI (Prelim) Exam - 27.10.2016 (1st Shift)

Directions (1-5): What should come in place of the question mark (?) in the following number series?

#1. 

7, 6, 8, 15, 44, ?

a) 88

b) 120

c) 159

d) 150

e) 195

#2. 

16, 25, 42, 66, 96, ?

a) 120

b) 160

c) 118

d) 131

e) 130

#3. 

4, 6, 9, 34, 68, ?

a) 56

b) 64

c) 161

d) 68

e) 116

#4. 

7.6, 9.9, 14.5, 23.7, ?

a) 42.2

b) 42.1

c) 42.3

d) 42.4

e) 42.5

#5. 

9, 5, 4, 7.5, 13, ?

a) 35

b) 26

c) 34

d) 48

e) 62

Answers:

1. e) 195

Solution:

7 x 1 – 1² = 6

6 x 2 – 2² = 8

8 x 3 – 3² = 15

15 x 4 – 4² = 44

44 x 5 – 5² = 195

2. d) 131

Solution:

+9….…..+17…..…+24……...+30….…..+35

        +8…….…+7….…...+6…...…...+5

96 + 35 = 131

3. c) 161

Solution:

4 x 2 – 2 = 6

6 x 3 – 9 = 9

9 x 4 - 2 = 34

34 x 5 – 9 = 161

4. b) 42.1

Solution:

+2.3 ….. +4.6 ….. +9.2 .…. +18.4

7.6 + 2.3 = 9.9

9.9 + 4.6 = 14.5

14.5 + 9.2 = 23.7

23.7 + 18.4 = 42.1

5. a) 35

Solution:

9 x 0.5 + 0.5 = 5

5 x 1 – 1 = 4

4 x 1.5 + 1.5 = 7.5

7.5 x 2 – 2 = 13

13 x 2.5 + 2.5 = 35

Thanks.