2. 外语
  3. A clinic worked every day last week and had at least one patient everyday. If 10 patients went there by bus, what is the probabi

A clinic worked every day last week and had at least one patient everyday. If 10 patients went there by bus, what is the probabi

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问题 A clinic worked every day last week and had at least one patient everyday. If 10 patients went there by bus, what is the probability that at least 2 patients went to the clinic on the same day?
选项 A、1
B、1/2
C、1/3
D、7/10
E、无法计算
答案A
解析 诊所上周七天都工作，每天至少有1个病人，现在共有10个病人看病，问至少有两个病人在同一天看病的概率。我们首先考虑至少有两个病人在同一天看病的情况，根据抽屉原则，一共有10个病人，而一个礼拜7天每天一个只能安排7个病人，那么一定有一天至少有两个病人看病，所以这道题目所求概率是1。
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