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

5(n-9)

C

2(n-9)

D

2(5n-9)

Verified by Experts

The correct Answer is:

A

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