Question
( 51 + 52 + 53 + .................. + 100) = ?
Answer: Option D
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This is an A.P. in which a = 51, `l` = 100 and n = 50.
`:.` sum = `n/2`(a + `l`) = `50/2` x (51 + 100) = ( 25 x 151) = 3775
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