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Kenneth Rosen Edition 7 Exercise 6.3 Question 41 (Page No. 415)

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A circular $r$-permutation of $n$ people is a seating of $r$ of these $n$ 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.
Find a formula for the number of circular $r$-permutations of $n$ people.
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Kenneth Rosen Edition 7 Exercise 6.3 Question 43 (Page No. 415)
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