1.  Choose the correct alternative that will continue the same pattern and replace the question mark in the given series : 1, 9 , 25, ?, 121

A. 64
B. 81
C. 91
D. 100

Answer: Option B

Explanation:

The given series consists of squares of consecutive odd numbers i.e. 1² , 3² , 5² , 7² ,...... so, missing term = 9² = 81.