Series Completion Interview Questions and Answers

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

A. 15
B. 39
C. 63
D. 127

Answer -

Option B

Explanation:

The correct pattern is x 2 + 1.

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

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