排列组合问题 6人围成一桌How many ways are there to seat six people around a circular table where seatings are considered to be the same if they can be obtained from each other by rotating the table

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排列组合问题 6人围成一桌
How many ways are there to seat six people around a circular table where seatings are considered to be the same if they can be obtained from each other by rotating the table

The answer is (6-1)!=120
If there are n people,then the answer is (n-1)!