1.

If (2 le r le n) , then ""^(n)C_(r)+2""^(n)C_(r+1)+""^(n)C_(r+2) is equal to

Answer»

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

ANSWER :C


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