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The value of r for which ""^(20)C(r) ""^...

The value of r for which `""^(20)C_(r) ""^(20)C_(0) + ""^(20)C_(r-1) ""^(20)C_(1) + ""^(20)C_(r-2) ""^(20)C_(2) + ....+ ""^(20)C_(0) ""^(20)C_(r)` is maximum, is

A

20

B

11

C

10

D

15

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The correct Answer is:
A
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