作者sleepsoy (洪小义)
看板Grad-ProbAsk
标题[理工] [机率]-成大94-电通 通讯数学
时间Thu Jan 28 17:11:41 2010
题目：
From a faculty of six professors , six associate professors , ten assistant
professors and twelve instructors , a committee , of size six is formed
randomly . What is the probability that there is at least one person from each
rank on the committee ?
不知道怎麽下手...请高手帮忙!!!
谢谢
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