向各位请教一道PREP题,俺数学不好 77. 9031-!-item-!-187;#058&006222 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 答案是24,请教如何解.题目的意思是不是"5人被安排在一个圆台,当相邻的2人不是亲戚的话会重新安排座位,问共有多少种安排"?,想不出,请各位帮忙给思路,谢过啊. |