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n points, circle passing through 3 points and have not n-3 interior ones

Source: 1997 Estonia National Olympiad Final Round grade 11 p4

March 11, 2020
circlescombinatoricscombinatorial geometry

Problem Statement

Let be given n3n\ge 3 distinct points in the plane. Is it always possible to find a circle which passes through three of the points and contains none of the remaining points (a) inside the circle. (b) inside the circle or on its boundary?