1.

For1le rlen,thevalueof""^(n)C_(r) +""^(n-1) C_(r) +""^(n-2)C_(r) + . . .+ ""^(r ) C _(r)is

Answer»

`""^(N)C_r+1`
`""^(n+1)C_r`
`""^(n+1)C_(r+1)`
NONE of these

ANSWER :C


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