Find the ODD one out from the given options.

Correct option is C

Logic – (first number× first number) + 1 = second number
a) 2 : 5
= (2 × 2) + 1 = 5
b) 1 : 2
= (1 × 1) + 1 = 2
c) 3 : 12
= (3 × 3) + 1 = 10
d) 4 : 17
= (4 × 4) + 1 = 17
Option c is odd from the other.