刚查过了，置顶贴里没有的一道prep

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?

Answer:24

是不是让一个人先固定，剩下的四个在排列呢？

即为A(4,4) ，好像讲不通...