Sigma(r=0)^(n)(n-r)(.^(n)C(r))^(2) is eq...

`Sigma_(r=0)^(n)(n-r)(.^(n)C_(r))^(2)` is equal to

A

`n^(2)(.^(2n-1)C_(n))`

B

`n^(2)(.^(2n)C_(n-1))`

C

`n^(2)(.^(2n-1)C_(n-1))`

D

`m^(2)(.^(2n-2)C_(n))`

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The correct Answer is:

D

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