3, 7, 15, 39, 63, 127, 255, 511 · ABC26GN5520

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

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

(a)7

(b)15

(c)39

(d)63

(e)127

Answer

Answer (as printed): C

Explanation

Go on multiplying 2 and adding 1 to get the next number. So, 39 is wrong.

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

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