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CIIM 2022 Problem 4

  • Day 2

Dado un entero positivo nn, determinar cuántas permutaciones σ\sigma del conjunto {1,2,…,2022n}\{1, 2, \ldots, 2022n\} tienen la siguiente propiedad: para cada i∈{1,2,…,2021n+1}i \in \{1, 2, \ldots, 2021n + 1\}, el número

σ(i)+σ(i+1)+⋯+σ(i+n−1)\sigma(i) + \sigma(i + 1) + \cdots + \sigma(i + n - 1)

es múltiplo de nn.

Official text Iberoamerican Interuniversity Mathematics Competition 2022 official paper, page 1. Quoted with source.

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