标题: bush那题的又一变体 [打印本页] 作者: arthur 时间: 2002-12-28 19:17 标题: bush那题的又一变体
Totally 10 people, including Harry. Pick 1 out of 10 for president, then pick 1 out of 9 for secretary, pick 1 out of 8 for treasurer. What is the probability that Harry will be picked for either secretary or treasurer?
请问答案是否为1/5作者: lisaislisa 时间: 2002-12-28 22:31
agree ^^
9/10*1/9+9/10*8/9*1/8
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