Mathematics, 20.03.2020 08:52 myjavier
Give a combinatorial proof that if n is a positive integer then ∑n k =0 k2 (n k ) = n(n + 1)2n−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 righthand side as n(n − 1)2n−2 + n2n−1.]
Answers: 1
Mathematics, 21.06.2019 22:30, edgartorres5123
What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.
Answers: 1
Give a combinatorial proof that if n is a positive integer then ∑n k =0 k2 (n k ) = n(n + 1)2n−2.[Hi...
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