Let n be a natural number. Give a combinatorial proof of the following: 2n C 2 n C 1 ! D
Chapter 17, Problem 17.19(choose chapter or problem)
Let n be a natural number. Give a combinatorial proof of the following: 2n C 2 n C 1 ! D 2n n C 1 ! C 2 2n n ! C 2n n 1 ! :
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