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The value of sum(r=1)^(10)r(n C(r))/(n ...

The value of `sum_(r=1)^(10)r(n C_(r))/(n C_(r-1)) `=

A

`5(2 n-9) `

B

`10 n `

C

`9(n-4) `

D

`5(n-4) `

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The correct Answer is:
A
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