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MathNet 2018-part-04 — 181 problems (EN–VI) Question 147

Math Olympiad Vault · MathNet 2018-part-04 — 181 problems (EN–VI)

Question 147

Consider a nonzero natural number $n$, a circle of length $6n$ and $3n$ points that divide the circle into $3n$ small arcs, such that $n$ of these arcs have length $1$, another $n$ of these arcs have length $2$, and the remaining $n$ arcs have length $3$.

Show that among the considered points there are two that are diametrically opposite.