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sum(r=1)^(30) r (""^(30)C(r))/(""^(30)C...

`sum_(r=1)^(30) r (""^(30)C_(r))/(""^(30)C_(r-1))=` ___________

A

930

B

465

C

310

D

630

Text Solution

Verified by Experts

The correct Answer is:
B
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