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Suppose that you want to choose a 2k + -element subset of the n- element set

Suppose that you want to choose a (2k + 1)-element subset of the n- element set {1, 2, . . . , n}. You decide by choosing first the middle element, then the k elements to its left, then the k elements to its right. Formulate the combinatorial identity you get from this. 

Apr 04 2020 View more View Less

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