1.

Let S_(n) denote the sum of the cubes of the first n natural numbers and S'_(n) denote the sum of the first n natural numbers, then underset(r=1)overset(n)Sigma ((S_(r))/(S'_(r))) equals to

Answer»

`(N(n+1) (n+2))/(6)`
`(n(n+1))/(2)`
`(n^(2) + 3n+ 2)/(2)`
NONE of these

Answer :A


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