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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:

3, 7, 15, 39, 63, 127, 255, 511

A 15

B 39

C 63

D 127

ANS:B - 39

Explanation: The correct pattern is x 2 + 1. So, 39 is wrong and must be replaced by (15 x 2 + 1) i.e. 31.