1.

""^(n) C_(r+1)+2""^(n)C_(r) +""^(n)C_(r-1)=

Answer»

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

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