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Prep-PS-77

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
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答案C

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这种题是我的死穴呀

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园排列问题(5-1)!=24
我们最值得自豪的不在于从不跌倒,而在于每次跌倒之后都爬起来。

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回复 4# caicainiao


    求个详解?

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回复 5# uruk


    我来吧,在Prep上扒的标准答案
Your Future, Our Mission. Topway--the world's best business school admission service.

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若為一直線排法 為5!
但此題目為圓形
五個人排圈圈...
ABCDE
BCDEA
CDEAB
DEABC
EABCD
都是一樣
故排圈圈時就是5!/5=4!
除以五是為了消除每次相鄰位置改變時都會有重複的情況
Your Future, Our Mission. Topway--the world's best business school admission service.

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看懂没?
Your Future, Our Mission. Topway--the world's best business school admission service.

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懂了懂了

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感谢一下myice

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