7, 26, 63, 124, 215, 342, (….)

Question:
7, 26, 63, 124, 215, 342, (….)

[A].

481

[B].

511

[C].

391

[D].

421

Answer: Option B

Explanation:

Numbers are (23 – 1), (33 – 1), (43 – 1), (53 – 1), (63 – 1), (73 – 1) etc.

So, the next number is (83 – 1) = (512 – 1) = 511.