Solved: Give a combinatorial proof that if n is a positive
Chapter 5, Problem 5.4.38(choose chapter or problem)
Give a combinatorial proof that if n is a positive integer then L:Z = o k 2G) = n(n + 1)2 n-2 . [Hint: Show that both sides count the ways to select a subset of a set of n elements together with two not necessarily distinct elements from this subset. Furthermore, express the right-hand side as n(n - 1)2 n-2 + n2n - l .]
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