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The sum of the series sum(r=1)^(n) (-1)^...

The sum of the series `sum_(r=1)^(n) (-1)^(r-1).""^(n)C_(r)(a-r), n gt 1` is equal to :

A

`n.2^(n+1)+a`

B

0

C

a

D

None of these

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The correct Answer is:
A
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