1.

For nge 2, let a_(n)=sum_(r=0)^(n)1/(C_(r)^(2)), then value of b_(n)=sum_(r=1)^(n)1/(r^(2)C_(r)^(2)) equals

Answer»

`1/(N^(2))a_(n)`
`1/(n^(2))a_(n-1)`
`a_(n)`
`a_(n)^(2)`

ANSWER :B


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