1.

The value of the expressionunderset(r=0)overset(n)Sigma overset(n)underset(p=0)Sigma""^(n)C_(r) ""^(r )C_(p)equals

Answer»

`2^(n)-1`
`3^(n)-1`
`n+2^(-n)-1`
`n-2^(n)-1`

ANSWER :B


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