1.

Find the sum to nterms of the series 3//(1^2xx2^2)+5//(2^2xx3^2)+7//(3^2xx4^2)+dot

Answer»

`(N^2-2n)/((n-1)^2)`
`(n^2+2n)/((n+1)^2)`
`(2n^2+1)/n`
none

Answer :B


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