15, 31, 63, 127, 255, (.....) · ABC26GN5495

Subject: General Aptitude · Chapter: Odd Man Out and Series

15, 31, 63, 127, 255, (.....)

(a)513

(b)511

(c)517

(d)523

Answer

Answer (as printed): B

Explanation

Each number is double the preceding one plus 1. So, the next number is (255 × 2) + 1 = 511.

Explanation as extracted from the printed page; notation may be imperfect.

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