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ZX-BE378D4BF72026年8月国际A卷 · 第 2 题
2026年8月国际A卷 · 原库模块 2 · Q2 参考答案
At a conference hall, there are a total of 300 visitors. Each visitor is located in either room A, room B, or room C. If one of these visitors is selected at random, the probability of selecting a visitor who is located in room A is 0.42 and the probability of selecting a visitor who is located in room B is 0.18. How many visitors are located in room C?
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