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.



(51+ 52 + 53 + ... + 100) = ?Sum =
n
(a + l)
=
50
x (51 + 100)   = (25 x 151)   = 3775.
2
2


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