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If n is a positive integer then using th...

If n is a positive integer then using the indentiy `(1+x)^(n)=(1+x)^(3)(1+x)^(n-3)`, prove that
`""^(n)C_(r)=""^(n-2)C_(r)+3*""^(n-3)C_(r-1)*""^(n-3)C_(r-2)+""^(n-3)C_(r-3)`

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