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" CC-3.Prove that "^(n)C(r)+n-1C(r)+n-2C...

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

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Prove that nC_(r)+n-1C_(r)+n-2C_(r)+.......+rC_(r)=n+1C_(1)

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