现在题很难。这是第29题

来源: 于 2024-12-25 20:54:23 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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.