1.  Choose the correct alternative that will continue the same pattern and replace the question mark in the given series : 6, 12, 21, ?, 48

A. 33
B. 38
C. 40
D. 45

Answer: Option A

Explanation:

The pattern is + 6, + 9, + 12, + 15, ........ So, missing term = 21 + 12 = 33.