(51+ 52 + 53 + ... + 100) = ?  Choices
A) 3775	B) 3795	C) 3800	D) 3900	E) 4000
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   3775)
<result>A</result>
(51+ 52 + 53 + ... + 100) = ?