In each the following questions, find the odd number/letters/number pair from the given alternatives.

Options

A. 26
B. 82
C. 15
D. 65

Answer

C

Explanation

Except the number 15 , all other numbers are based on the pattern `x^(2) + 1`
`26 = (5)^(2) + 1`
`82 = (9)^(2) + 1`
`65 = (8)^(2) + 1`
But , `15 = (4)^(2) - 1`