THE ROUND TABLE

Seat the same n persons at a round table on

`((n-1)(n-2))/2`

occasions so that no person shall ever have the same two neighbours twice. This is, of course, equivalent to saying that every person must sit once, and once only, between every possible pair.

组合数学

来源：

Amusements in Mathematics, Henry Ernest Dudeney 问题 273

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