现在题很难。这是第29题

来源: rapidestate 于 2024-12-25 20:54:23 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (244 bytes)

Stephanie rolls three standard dice. What is the probability that the product of the three numbers she rolled is not a multiple of 8? Express your answer as a common fraction.

我后来花了20分钟才做出来: by casework.

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