What should come in place of the question mark 39 39 in the following number series 15 31 63 127 511...........

Quantitative Aptitude (SBI-CL) Number series

What should come in place of the question mark '?' in the following number series?

15, 31, 63, 127, ?, 511

This questions was previously asked in

SBI Clerk Prelims (11 Jul, 2021 Shift 1)

254

258

245

255

None of these

255

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