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15. Prove that if n and k are integers with 1s k s n then n-1 a) By using a combinatorial proof. b) By using

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15. Prove that if n and k are integers with 1s k s n then n-1 a) By using a combinatorial proof. b) By using an algebraic proof. 16. Give a combinatorial proof that ft n . 2n-1

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