721脑筋急转弯简单数值题short
All-Category Coverage Probability 1
题目
6 independent tickets are each assigned uniformly to one of 3 categories. What is the probability that every category appears at least once?
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提交作答时记录，用于后续平均用时统计。
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题目
6 independent tickets are each assigned uniformly to one of 3 categories. What is the probability that every category appears at least once?
解题计时
0:00
提交作答时记录，用于后续平均用时统计。
你的答案