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题目内容
Three typists work for four different companies. Each company has one document, and each document can be assigned to any of the three typists. What is the probability that three typists all receive documents?
Give your answer as a fraction.
Give your answer as a fraction.
36 /81显示答案
· 相关考点
6.3.5 特殊排列组合技巧
6.3.5 特殊排列组合技巧
以上解析由 考满分老师提供。