The sum of the following series 1 + 6 + 9(1^2 + 2^2 + 3^2) 7 + 12(1^2 + 2^2 + 3^2 + 4^2) 9 + 15(1^2 + 2^2 + +...

Question

The sum of the following series 1 + 6 + 9(1^2 + 2^2 + 3^2) 7 + 12(1^2 + 2^2 + 3^2 + 4^2) 9 + 15(1^2 + 2^2 + + 5^2) 11 + up to 15 terms, is:

Accepted Answer

(C)

JEE Main 2019 Mathematics question