(51+ 52 + 53 + ... + 100) = ? Options: A . &nbsp2525 B . &nbsp2975 C . &nbsp3225 D . &nbsp3775

(51+ 52 + 53 + ... + 100) = ?

Question

(51+ 52 + 53 + ... + 100) = ?

Options:

A . 2525

B . 2975

C . 3225

D . 3775

Answer: Option D

This is an A.P. in which a = 51, l = 100 and n = 50.

Sum = n (a + l) = 50 x (51 + 100) = (25 x 151) = 3775. 2 2

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