Consider the following formula: k n k ! D n n 1 k 1 ! : Give two different proofs. One
Chapter 17, Problem 17.16(choose chapter or problem)
Consider the following formula: k n k ! D n n 1 k 1 ! : Give two different proofs. One proof should use the factorial formula for n k (Theorem 17.12). The other proof should be combinatorial; develop a question that both sides of the equation answer
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