1.

S_(n) = (1+2+3+....+n)/( n) then S_(1)^(2) + S_(2)^(2) + S_(3)^(2) + ..... + S_(n)^(2) =

Answer»

`(n)/( 24) (2n^(2) + 9N+13)`
`(1)/( 24) ( 2n^(2) + 9n+13) `
`(n^2)/( 24) (2n^(2) + 9n+13)`
`(n)/( 24) ( 2n^(2) - 9n +13)`

ANSWER :A


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