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质地均匀的正四面体骰子的四个面上分别写有数字2,3,4,5,投掷这个正四面体两次...
质地均匀的正四面体骰子的四个面上分别写有数字2,3,4,5,投掷这个正四面体两次,则第一次底面上的数字能够整除第二次底面上的数字的概率是 .
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