1.  Choose the correct alternative that will continue the same pattern and replace the question mark in the given series : 1, 9, 25, 49, 81, ?

A. 100
B. 112
C. 121
D. 144

Answer: Option C

Explanation:

The series consists of squares of consecutive odd numbers i.e. 1². 3², 5², 7², 9²,..... so, missing term 11² = 121.