Number Series Asked in SBI PO Prelims Exam (Slot-I) - 09.07.2016

Directions (1-5): What should come in place of the question mark (?) in the following number series?
1. 150            102            70            46            26            ?
a) 16
b) 8
c) 10
d) 2
e) 4
2. 10            14            28            52            134            ?
a) 302
b) 268
c) 300
d) 304
e) 208 

3. 4500            900            90            6            ?            0.012
a) 0.3
b) 3
c) 3.33
d) 0.33
e) 3.3 

4. 24            11            10            14            27            ?
a) 66
b) 70.5
c) 68
d) 66.5
e) 68.5 

5. 8            7            12            33            128            ?
a) 528
b) 365
c) 653
d) 825
e) 635

Answers: 


1. b) 8

Solution:


2. d) 304

Solution:

10*3 - 2= 28
14*4 - 4= 52
28*5 - 6= 134
52*6- 8= 304 

3. a) 0.3

Solution:

4500/5 = 900
900/10 = 90
90/15 = 6
6/20 = 0.3
0.3/25 = 0.012 

4. d) 66.5

Solution:

24*(1/2) – 1 = 11
11*(2/2) – 1 = 10
10*(3/2) – 1 = 14
14*(4/2) – 1 = 27
27*(5/2) – 1 = 66.5 

5. e) 635

Solution:

8*1 – 1 = 7
7*2 – 2 = 12
12*3 – 3 = 33
33*4 – 4 = 128
128*5 – 5 = 635 

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