1. 

(12 + 22 + 32 + ... + 102) = ?
A. 330
B. 345
C. 365
D. 385

Answer: Option D

Explanation:

We know that (12 + 22 + 32 + ... + n2)

= 1 n(n + 1)(2n + 1)
6

Putting n = 10, required sum

= 1 x 10 x 11 x 21 = 385
6