1.

""^(n)C_(r)+4.""^(n)C_(r-1)+6.""^(n)C_(r-2)+4.""^(n)C_(r-3)+""^(n)C_(r-4) is equal to

Answer»

`""^(n+4)C_(R)`
`2.""^(n+4)C_(r-1)`
`""^(n)C_(r)`
`11.""^(n)C_(r)`

ANSWER :A


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