In the following number series only one is wrong. Find out the wrong number 7, 4, 5, 9, 20, 51, 106.5 ?




In the following number series only one is wrong. Find out the wrong number. 7, 4, 5, 9, 20, 51, 106.5 ?

A . 4

B . 5

C . 9

D . 20

E . 51

Answer : E . 51


Explanation:


    The series is x 0.5 + 0.5, x 1 + 1, x 1.5 + 1.5. x 2 + 2, x 2.5 + 2.5, x 3 +3


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