1.

If ""^(n)C_(r) denotes the number of combinations of n things taken r at a time, then the expression ""^(n)C_(r+1)+""^(n)C_(r-1)+2xx""^(n)C_(r), equals

Answer»

`""^(n+2)C_(R+1)`
`""^(n+1)C_(r)`
`""^(n+1)C_(r+1)`
`""^(n+2)C_(r)`

ANSWER :A


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