133概率中等数值题medium

Exactly One Pair Among Four Dice

题目

You roll 4 fair six-sided dice. What is the probability that exactly two of the four dice show the same value and the other two dice each show values different from each other and from the pair?

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你的答案

数值

probability

只填写数值本身，单位 probability 已固定在输入框右侧。