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kechongfuzuhewentixiangjie
- 有 n 个不同的元素,每个元素可以选多次,一共选 k 个元素,有多少种选法?例如, n=3,k=2 时,有(1,1), (1,2), (1,3), (2,2), (2,3), (3,3), 共 6 种选法。-There are n distinct elements, each element can be selected multiple times, for a total choose k elements, there are many kinds of election law?