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

The value of `sum_(r=1)^(10) r. (""^(n)C_(r))/(""^(n)C_(r-1)` is equal to

A

5 (2n -9)

B

10 n

C

9 (n-4)

D

None of these

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a
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