What is the probability that if there are four people in a r

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/16 05:01:22

What is the probability that if there are four people in a room,at least two of them have the same birth month?
一个房间有4个人,最少2个人生日是同月的概率是多少

这个问题可能需要在每个人的生日月份概率都是1/12的前提下进行（要不然按365天平均的概率就算死了…）
4个人的生日月份可能性有12*12*12*12=20736
最少2个人生日同月份,反面是“4个人生日在不同的4个月”,可能性有：12*11*10*9=11880
所以最少2个人生日同月份的概率是1-12*11*10*9/(12*12*12*12)=41/96
希望我的概率和算术还没有退化到一定程度= =

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