请教一道题~~在线等答案

At a dinner party, 5 people are to be seated around a circular table.  Two seating arrangements are considered different only when the positions of the people are different relative to each other.  What is the total number of different possible seating arrangements for the group?

(A) 5

(B) 10

(C) 24

(D) 32

(E) 120

答案选C  请亲帮忙解释一下为什么

因为围成一圈要比五个人在直线排序少一种情况哈~

所以是P4就可以了~

这题是典型的圆形排列，就是用直线排列减掉一个单位的方法．直线排５人是P(5,5).那么减一个单位就是Ｐ(4,4).结果就是２４．

这个法则，你要记住就好了．推理过程没有必要细纠．