1.

IFS=overset ( m) sum"" ^(n+r ) C_(k),then

Answer»

`S+""^(N)C_(K+1) =-""^(n)C_(K+1)`
`S+""^(n)C_(K+1)=""^(n+m+1) C_(K+1)`
`S= ""^(n)C_K =""^(n+m)C_(K)`
NONE of these

ANSWER :B


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