In each of the following questions four of the given five are alike in a certain way and form a group .Which is the one that does not belong to that group in the following questions ?

Options

A. 28
B. 65
C. 215
D. 126

Answer

C

Explanation

Except 215 , all others are in `X^(3)+1` pattern
i.e., `1^(3)+1-2,4^(3)+1=65,5^(3)+1=126,2^(3)+1=9`
But `6^(3)-1=215`.