推 jasonkeen:中山應數的嗎？ 答案錯了… 02/15 02:01
→ penatnl:嗯~是中山應數的!!! 那答案是多少?? 02/15 12:51
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 可是我不知道怎麼算出來
希望大家幫我解答!!! 拜託各位了
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