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If n is an even natural number , find th...

If n is an even natural number , find the value of
` sum_(r=0)^(n) ((-1)^(r))/(""^(n)C_(r))`

A

0

B

`1/n`

C

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

D

None of these

Text Solution

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The correct Answer is:
A
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