1.

If a_(n)=sum_(r=0)^(n)(1)/(""^(n)C_(r)) then sum_(r=0)^(n)(r)/(""^(n)C_(r)) equal to

Answer»

`""^((n-1))a_(0)`
`n.a_(n)`
`(1)/(2)n.a_(n)`
`a_(n+1)`

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