1.

""^(m)C_(r+1)+ sum_(k=m)^(n)""^(k)C_(r) is equal to :

Answer»

`""^(N)C_(r+1)`
`""^(n +1)C_(r +1)`
`""^(n)C_(r-1)`
`""^(n)C_(r-1)`

ANSWER :B


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