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Turkey TST 2017 P9

Source: Turkey TST 2017 P9

June 1, 2017
TurkeyTSTcombinatorics

Problem Statement

Let SS be a set of finite number of points in the plane any 3 of which are not linear and any 4 of which are not concyclic. A coloring of all the points in SS to red and white is called discrete coloring if there exists a circle which encloses all red points and excludes all white points. Determine the number of discrete colorings for each set SS.