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数学概率求解答!!

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OGREkillerA

发表于2023-03-10
What is the probability that A and B are both selected when you select 40 people out of a group of 100 (A and B included)? Give your answer as a fraction. 答案给的是26/125,为啥啊,有人能说明一下思路吗?万分感谢!!

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794293kgcm

2023-03-16

简单,组合问题,C98,38/C40,100