1.

If t_(r) = (r+2)/(r(r+)). 1/(2^(r+1))then sum_(r=1)^(n) is equal to

Answer»

`(N2^(N)-1)/(n+1)`
`(n+1)/(2^(n+1)(n+2))`
`n/(2^(n))-1`
`((n+1)2^(n)-1)/(2^(n+1)(n+1))`

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