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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
admin
2021-10-21
41
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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GMAT QUANTITATIVE题库GMAT分类
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GMAT
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