Number Series Asked in IBPS RRB OS - V (Prelim) Exam - 04.11.2016 (1st Shift)

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

#1. 

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


#2. 


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

#3. 


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

#4. 


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

#5. 


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

Answers:


1. 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
 
2. d) 62

Trick: difference of prime numbers

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

Ans: 45 + 17 = 62
 
3. 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

4. a) 771

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

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