The sum of the series underset(r=1)overs...

The sum of the series `underset(r=1)overset(n)sum(-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

Verified by Experts

The correct Answer is:

C

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