Question

Direction (3-4): In each of the following questions, four numbers are given out of which three are alike
in some manner while one is different. Choose the one
which is different from the rest three.
3. (A) 21
(B) 69
(C) 81
(D) 83
4. (A) 13
(B) 17
(C) 23
(D) 37​

Answer 1

$\huge{\underline{\underline{\boxed{\sf{\purple{Answer ࿐}}}}}}$

Here, in each of the group, every letter moves 4 steps ahead to obtain next letter of the same term.

But in (C), letters moves 2,3,3 steps ahead to obtain the next letter.

Hence, option (C) is the correct answer.