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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本试题收录于: GMAT QUANTITATIVE题库GMAT分类
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