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Prove that , .^(n)C(r)+3.^(n)C(r-1)+3.^(...

Prove that , `.^(n)C_(r)+3.^(n)C_(r-1)+3.^(n)C_(r-2)+^(n)C_(r-3)=^(n+3)C_(r)`

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Prove that 3lerlen ""^(n-3)C_(r)+3""^(n-3)C_(r-1)+3""^(n-3)C_(r-2)+""^(n-3)C_(r-3)=""^(n)C_(r)