Number Series Asked in IBPS RRB OS - V (Prelim) Exam - 05.11.2016 (1st Shift)

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

#1. 

6          4           5           11           39           ?
a) 188
b) 198
c) 189
d) 199
e) 200

#2. 

14          7         7          14          56           ?
a) 158
b) 184
c) 484
d) 884
e) 448

#3. 

2          3          7          16           32           ?
a) 57
b) 59
c) 56
d) 60
e) 75

#4. 

8          14           24          38           56           ?
a) 55
b) 65
c) 96
d) 78
e) 87

#5. 

5          7          13           25           45           ?
a) 57
b) 75
c) 55
d) 77
e) 54

Answers:


1. c) 189

Solution:
6 x 1 – 2 = 4
4 x 2 – 3 = 5
5 x 3 – 4 = 11
11 x 4 – 5 = 39
39 x 5 – 6 = 189

2. e) 448

Solution:
14 x 0.5 = 7
7 x 1 = 7
7 x 2 = 14
14 x 4 = 56
56 x 8 = 448

3. a) 57

Solution:
2 + 12 = 3
3 + 22 = 7
7 + 32 = 16
16 + 42 = 32
32 + 52 = 57

4. d) 78

Solution:
8……....14….....24….......38….....56
…..+6…...+10…....+14…......+18
…….+4……...+4…......…+4…….+4

Answer: 56 + 18 + 4 = 78

5. b) 75

Solution:
5….....…7……...13…......25….......45
…....+2….....+6…......+12..….+20
…......…+4…...…+6….......+8……+10

Answer: 45 + 20 + 10 = 75

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