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With usual notations, C(0)C(r )+C(1)C(...

With usual notations,
`C_(0)C_(r )+C_(1)C_(r+1) +C_(2)C_(r+2) +…+C_(n-r)C_(n)=`

A

`((2n)!)/((n-r) ! (n+r)!)`

B

`(n!)/((-r)!(n+t)!)`

C

`(n!)/((n-r)!)`

D

None of these

Text Solution

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The correct Answer is:
A
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