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There are 2 different choices of Product A, 4 different choices of Product B and 5 different choices of Product C. In how many ways can these products be selected if either 1 or none of item is selected out of Product A, B, and C, respectively?
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· 相关考点
6.3.1 基本计数原理与加法原理
6.3.1 基本计数原理与加法原理
以上解析由 考满分老师提供。
