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(Discrete Math) Read the following combinatorial proof, and write a theorem that we proved. Explain it...

(Discrete Math) Read the following combinatorial proof, and write a theorem that we proved. Explain it in details.

We count the number of k+1 element subsets of [n+1]. On one hand, it is clearly C(n+1,k+1). On the other hand, we can count these subsets in two steps. First we count the subsets that contain the number n+1. Since have to choose another k elements from {1,2,...,n} for it to make a k+1-element set, the number of these is C(n,k). Then we count the subsets that do not contain the number n+1. This time, we have to choose all k+1 elements from {1,2,...,n}. The number of these is C(n,k+1).

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