There are $2n$ people. There are $2n!$ ways to arrange them.
The number of ways to arrange them such that couples are always together is $n! \cdot 2^n$
How do you calculate the number of ways to arrange them such that no couples are together?
2026-05-04 21:59:45.1777931985
How many ways are there to arrange $n$ married couples in a line so that a husband and his wife are not together?
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