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题库 / Prep2007E1-PS-77
At a dinner party, 5 peopleare to be seated around a circular table. Two seating arrangements are considered different only when thepositions of the people are different relative to each other. What is the total number of different possibleseating arrangements for the group?
5
10
24
32
120
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第一个人随便坐哪里；第二个人无论坐哪里，相对于第一个人的位置都是不一样的，有4种选择；第3个人有3种选择……，总共有4*3*2*1种选择。
5！/5 =24
圆桌题 (n-1)!