If n is an even natural number , then su...

If n is an even natural number , then `sum_(r=0)^(n) (( -1)^(r))/(""^(n)C_(r))` equals

A

0

B

`1/n`

C

`(n)/(2^(n))`

D

None of these

Verified by Experts

The correct Answer is:

A

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