1.

Mean of the numbers 1,2,3,…,n with respective weights 1^(2) + 1, 2^(2) + 2, 3^(2) + 3,…,n^(2)+n is

Answer»

`(3N+2)/(2)`
`(3n+1)/(4)`
`(2N+1)/(3)`
`(3n(n+1))/(2(2n +1))`

ANSWER :B


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