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

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127

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Solution

The correct option is B 39
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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1, 3, 7, 15, 31, 63, 127, . . . .

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