ChaseDream

标题: 数学题求问（概率类） [打印本页]

作者: JR3 时间: 2019-10-5 16:15
标题: 数学题求问（概率类）

The acceptance rate at a certain business school is 15% for the first time applicants and 20% for all

re-applicants. If David is applying for admission for the first time this year, what is the probability that he will

have to apply no more than twice before he is accepted?

求问该怎么考虑？

作者: yangyangdd 时间: 2019-10-5 17:58
15% + 85%*20%

欢迎光临 ChaseDream (https://forum.chasedream.com/)