3, 7, 13, 20, 31

3, 7, 13, 20, 31

Direction: Find out the wrong number in the following number series.

Q. 3, 7, 13, 20, 31

A.3

B.7

C.13

D.20

E.21

Sol:

12 + 2 = 3

22 + 3 = 7

32 + 4 = 13

42 + 5 = 21

52 + 6 = 31

quantitative aptitude
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