Questions tagged [recreational-mathematics]
Applications of mathematics for the design and analysis of games and puzzles
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Algorithm for selecting a fixed-point free permutation $\varphi:\{1,\ldots,n\}\to\{1,\ldots,n\}$
Motivation. In my younger son's class, everyone has to give a (small) Christmas present to one other student. Let $n\in\mathbb{N}$ be the number of students in the class. If you pick a permutation $\...
