If C(r) stands for ""^(n)C(r) and sum(r=...

If `C_(r)` stands for `""^(n)C_(r) and sum_(r=1)^(n)(r*C_(r))/(C_(r-1))=210`, then n equals:

A

19

B

20

C

21

D

none of these

Text Solution

Verified by Experts

The correct Answer is:

B

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