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

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