求助！prep第一套几个数学题不会做，求助大神~

cjr114

1、
At a dinner party, 5 people are to be seated around a circular table. Two seating arrangement 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?

wsxix

圆桌问题，“Two seating arrangement are considered different only when the positions of the people are different relative to each other” 意思就是相对位置变化不影响位置可能性。
先固定一个人的座位，然后剩下4人填充剩下的位置。所以是4！=4*3*2*1=24