Question

Find the odd one among the following :

Accepted Answer

C. $143 = 12^2 - 1$ $168 = 13^2 - 1$ $195 = 14^2 - 1$ $225 = 15^2$ (a perfect square, whereas others are $n^2 - 1$). Thus 225 is the odd one out.

Odd One Out in Numbers

Practise this under exam conditions