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

1.	(51+ 52 + 53 + ... + 100) = ?
Answer» 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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