1998 OIM Problems/Problem 4

Problem

Representatives of $n$ countries ($n\ge 2$) are seated around a round table, so that they satisfy the following condition: if two people are from the same country, then their respective neighbors on the right cannot be from the same country. For each $n$, find the maximum number of people that can be around the table.

~translated into English by Tomas Diaz. ~orders@tomasdiaz.com

Solution

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See also

https://www.oma.org.ar/enunciados/ibe13.htm