ABC26GN5495 · Odd Man Out and Series

Subject: General Aptitude · Chapter: Odd Man Out and Series · Exam: · Marks: · Difficulty:

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.