Complete the number series: 15, 31, 63, 127, 255, ……?

A) 513

B) 511

C) 523

D) 517

The logic of this series is: The next number would be double of current number plus 1

Example: The next number of 15 would be (15 x2) + 1 i.e. 31

The next number would be (31x 2) + 1 i.e. 63. And so on ….

Hence answer is: (255×2) + 1 i.e. 511

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