Number Series Asked in SBI PO Prelims Exam (Slot-I) - 02.07.2016

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

1. 7        5        7        17        63       ?

2. 50      ?     61      89      154       280

3. 17     19       25      37      ?       87

4. 11      14      19       28      43       ?

5. 26     144       590      1164      ?

Answers:

Solution:
7 x 1 – 2 = 5
5 x 2 – 3 = 7
7 x 3 – 4 = 17
17 x 4 – 5 = 63
63 x 5 – 6 = 309 

Solution:
50..50+(1^3+1) = 52
52+(2^3+1)=61.
61+(3^3+1)=89
89+(4^3+1)=154
154 + (5^3+1) = 280 

Solution:
17 + 1 x 2 = 19
19 + 2 x 3 = 25
25 + 3 x 4 = 37
37 + 4 x 5 = 57
57 + 5 x 6 = 87 

Solution:
3….5...9...15...23
…2....4....6....8…

Answer 43+23= 66 

5. b) 1182

Solution:
26 x 6 – 12 = 144
144 x 4 + 14 = 590
590 x 2 – 16 = 1164
1164 x 1 + 18 = 1182 

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