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Series Completion - Verbal and Reasoning

Directions to SolveChoose the correct alternative that will continue the same pattern and replace the question mark in the given series.
Q1:

1, 2, 6, 7, 21, 22, 66, 67, ?

A 70

B 134

C 201

D 301

ANS:C - 201

Explanation: The pattern is + 1, x 3, + 1, x 3, + 1, x 3, + 1,..... So, missing term = 67 x 3 = 201.