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Series Completion - Verbal and Reasoning

Directions to SolveIn this type of questions, one term in the number series is wrong. Find out the wrong term.
Q1:

1, 3, 10, 21, 64, 129, 356, 777

A 21

B 129

C 10

D 356

ANS:D - 356

Explanation: The correct pattern is x 2 + 1, x 3 + 1, x 2 + 1, x 3 + 1,..... So, 356 is wrong and must be replaced by (129 x 3 + 1) i.e. 388.