7, 26, 63, 124, 215, 342, (.....) · ABC26GN5499

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

7, 26, 63, 124, 215, 342, (.....)

(a)481

(b)511

(c)391

(d)421

Answer

Answer (as printed): B

Explanation

Numbers are $(2^3 – 1), (3^3 – 1), (4^3 – 1), (5^3 – 1), (6^3 – 1), (7^3 – 1)$ etc. So, the next number is $(8^3 – 1) = (512 – 1) = 511$.

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

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