Question

Numbers in the following question are grouped under a certain norm, except, the one which does not follow the norm. Find that odd one.

• A. $3,7,5$
• B. $2,8,6$
• C. $7,9,5$
• D. $3,8,2$

Answer 1

The correct option is D $3,8,2$

In options A, B and C, the sum of all the digits in that particular set is a composite number. i.e. $15,16$ and $21$.

However, the sum of digits of option D is $13$ viz. a prime number.

Hence, option D is the odd one.