ONE QUESTION, ONE STEP
ZX-42382133372025年3月国际C卷 · 第 12 题
2025年3月国际C卷 · 原库模块 1 · Q12 原库参考解析
At a convention center there are a total of 275 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 0.68, and the probability of selecting a visitor who is located in room B is 0.24. How many visitors are located in room C?
参考答案：
解题思路
容易忽略的一步
