1.   Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
1, 2, 6, 7, 21, 22, 66, 67, ?

A. 70
B. 134
C. 201
D. 301

Answer: Option C

Explanation:

The pattern is + 1, × 3, + 1, × 3, + 1, × 3, + 1, ........ So, missing term = 67 × 3 = 201.