Re: [閒聊] 謝謝北鼻~逼逼
看板BuRuRadio作者georgewesley (喬治衛斯李)時間17年前 (2007/06/20 21:56)推噓141(141推 0噓 95→)留言236則, 15人參與討論串4/4 (看更多)
答案是80種
迅速的解答一下
這是不盡相異物直線排列
6!/3! ====>所有的排列方法
然後要扣掉北和來相鄰的
把"北"和"來"視為一個字
所以 5!/3! X 2 ======>X2是因為北和來可以互換
所以
答案是 6!/3! - 2(5!/3!) = 80
你 答對了嗎?
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