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排一圈的排列组合
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C。我是蒙的，用120除以了5。应为每次有5个重复。有没有人有一些标准的解决子等问题的方法呀 ？分享一下啦~~~ |
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