47. Insert the missing number.: 15, 31, 63, 127, 255, (….)

By /
[A]. 513
[B]. 511
[C]. 517
[D]. 523
✅ The correct answer is option B.
Each number is double the preceding one plus 1.
So, the next number is (255 x 2) + 1 = 511.

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