Aptitude | Series | Question 11

Find wrong number in series:
7, 26, 63, 124, 215, 342,496
(A) 7
(B) 63
(C) 215
(D) 496


Answer: (D)

Explanation: (23 – 1), (33 – 1), (43 – 1), (53 – 1), (63 – 1), (73 – 1), (83 – 1) = 511

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