Number Series Asked in IBPS PO - VI (Prelim) Exam - 22.10.2016 (2nd Shift)

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

1) 8 4.5 5.5 13 56 ?  
2) 19 16 44 107 ?
3) 11 14 23 50 ?
4) 19 25 42 71 113 ?
5) 21 35 30 44 39 ?

Answers:

1. e) 456

Solution:
8 x 0.5 + 0.5 = 4.5
4.5 x 1 + 1 = 5.5
5.5 x 2 + 2 = 13
13 x 4 + 4 = 56
56 x 8 + 8 = 456

2. b) 215
Solution:

3. c) 131

Solution:
11 + 3¹ = 11 + 3 = 14
14 + 3² = 14 + 9 = 23
23 + 3³ = 23 + 27 = 50
50 + 3⁴ = 50 + 81 = 131

4. d) 169

Solution:

5. e) 53

Solution:
21 + 14 = 35
35 – 5 = 30
30 + 14 = 44
44 – 5 = 39
39 + 14 = 53

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