Series Completion

Directions to SolveChoose 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

ANS:C - 201

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

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