1.

If s_(n) = sum_(r = 0)^(n) 1/(""^(n)C_(r)) and t_(n) = sum _(r = 0)^(n) r/(""^(n)C_(r)),then t_(n)/s_(n) is equal to

Answer»

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

ANSWER :C


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