Question

Seven person wearing medals with numbers
1, 2, 3, 4, 5, 6, 7 are seated on 7 chairs
around a circular table. In how many ways
can they be seated so that no two persons
whose medals have consecutive numbers
are seated next to each other? (Two
arrangements obtained by rotation around
the table are considered different)
Answer:​

Answer 1

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Answer 2

Answer:

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