Discussion Forum



1)

(51 + 52 + 53 + ..... + 100) is equal to :


A) 2525

B) 2975

C) 3225

D) 3775

Answer:

Option D

Explanation:

This is an A.P. in which a = 51, I = 100 and n = 50.
$\frac{n}{2}(a+I)=\frac{50}{2}(51+100)$
= (25 x 151) = 3775.