What should come in place of the question mark (?) in each of the following questions ?
12 + 22 + 32 + ... + 102 = ?
Pick one.
A) 400 B) 625 C) 380 D) 385 E) 370
Explanation :   Sum of the squares of first 'n' natural number = n(n+l)(2n+l)/6 Put n = 10. 10x 11x21/6=55x7=385.   Answer : Option 385
<result>D</result>
What should come in place of the question mark (?) in each of the following questions ?
12 + 22 + 32 + ... + 102 = ?