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Maths高手請入

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John and Mary invite 8 friends to their christmas party,by the end of the party , the participants are arranged in 2 rows of 5 in order to take a photograph.Find the number of arrangements that can be made if john and mary are next to each other. 條式係咁: 8C3(5!)(4!)(2)(2)=645120 有冇人講我知點解係咁--

最佳解答:

John and Mary invite 8 friends to their christmas party,by the end ofthe party , the participants are arranged in 2 rows of 5 in order totake a photograph.Find the number of arrangements that can be made ifjohn and mary are next to each other. Sol if arrange as ABCDE FGHIJ John and Mary maybe (A,B),(B,C),(C,D),(D,E) (F,G),(G,H),(H,I),(I,J) number of arrangements =2*8*8! =645120 2009-06-02 13:09:31 補充: 8C3==>8人選3人與 John Mary 同排 8C3(5!)==>其他5人同一排 8C3(5!)(4!)==>John Mary 與 另三人排列 8C3(5!)(4!)(2)==>John Mary 分左右 8C3(5!)(4!)(2)(2)==>John Mary 在上下排

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唔明你問乜--|||||公式係咪 nCr (a)^r (1-a)^(n-r)
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