求助PREP里一题

fdx3000 · 发表于 2010-6-4 21:44:38

Prep里面的一道题目
At a dinner party, 5 people are to be seated around a circular table. Two seating arrangements are considered different only when the position of the people are different relative to each other. What is the total number of different possible seating arrangements for the group? 答案是24。搞不懂啊。请NN 指点~~谢谢

nathanael · 发表于 2010-6-4 21:47:16

园排列问题(5-1)!=24

fdx3000 · 发表于 2010-6-4 22:12:15

谢谢LS 能不能具体说说~~~额

nathanael · 发表于 2010-6-5 14:21:52

那个啊,你想如果是一个直线的话是5!的情况,可是变成圆的可以旋转,所以要除以5是4!

求助PREP里一题

所属分类: GMAT考试

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