1.

""^(n-2)C_(r)+2.""^(n-2)C_(r-1)+""^(n-2)C_(r-2) is equal to

Answer»

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

ANSWER :B


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