Number Series Questions Asked in IBPS RRB Exam 2016 (Based on Memory)

Number Series Questions Asked in IBPS RRB Exam 2016 – 4th November 206 – First Shift (Based on Memory)

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

1.

3           1.5           1.5           2.25           4.5           ?
a) 9.5
b) 11.25
c) 12.25
d) 10.45
e) 5.5

2.

2           4           11           37           153           ?
a) 771
b) 661
c) 551
d) 441
e) 221

3.

4           4           6           12           24          ?
a) 58
b) 42
c) 40
d) 42
e)  44

4.

3          10           22           39           61           ?
a) 88
b) 85
c) 66
d) 95
e) 83

5.

9           14           21           32           45           ?
a) 52
b) 56
c) 72
d) 62
e) 66

Answers

1. b) 11.25

Solution:
3 * 0.5 = 1.5
1.5 * 1 = 1.5
1.5 * 1.5 = 2.25
2.25 * 2 = 4.5
4.5 * 2.5 = 11.25

2. a) 771

Solution:
2 * 1 + 2 =4
4 * 2 + 3 = 11
11 * 3 + 4= 37
37 * 4 + 5 = 153
153 * 5 + 6= 771

3. e) 44

Trick: difference upto two lines

Solution:

4………..4………6………12…….…24

….+0……..+2……..+6……….+12
….…+2……….+4………+6

Ans: 24 + 12 + 8 = 44

4. a) 88

Trick: difference upto two lines

Solution:
3……….10………22……….39………61
…..+7…….+12…….+17…….+22
………+5…….+5……….+5

Ans: 61 + 22+ 5 = 88

5. d) 62

Trick: difference of prime numbers

Solution:
9….14…..21……32………45
…+5…+7….+11……+13

Ans: 45 + 17 = 62

Best Wishes !!!!!!!

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