130概率困难数值题long
Expected Distinct Faces on Four Dice
题目
You roll four fair six-sided dice. What is the expected number of distinct face values that appear among the four dice?
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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
You roll four fair six-sided dice. What is the expected number of distinct face values that appear among the four dice?
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