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. 120
B. 168
C. 290
D. 380

Answer

D

Explanation

Except 380 , all others are either in `X^(2)-1orX^(2)+1` pattern i.e.,
`120=11^(2)-1,168=13^(2)-1`,
`290=17^(2)+1,728=27^(2)-1`
But `380=19^(2)+9or20^(2)-20`