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Sequence

In following ...

Question

In following question, a number series is given with one term missing. Choose correct alternative
15, 31, 63, 127, 255, x

A

513

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B

511

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C

517

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D

523

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Solution

The correct option is B 511
(1) Each number is double the preceding one plus
1 ( 255 $\times$ 2 ) + 1 = 511

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