Question

Choose the odd one out
A. 121
B. 81
c. 169
D. 49​

Answer 1

According to me, answer should be B.81

Reason in 121=11 square and 11 is prime number

169=13 square and 13 is a prime number

49=7 square and 7 is a prime number

But 81=9 square and 9 is a composite number