作者penatnl (penatnl)
看板Statistics
标题[问题]机率 环状排列
时间Sun Feb 15 01:34:33 2009
if 10 married couples are randomly seated at a round table
computed the expected number of the number of wives who are
seated next to their husbands
答案是20/9 可是我不知道怎麽算出来
希望大家帮我解答!!! 拜托各位了
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1F：推 jasonkeen:中山应数的吗？ 答案错了… 02/15 02:01
2F：→ penatnl:嗯~是中山应数的!!! 那答案是多少?? 02/15 12:51