MathDB
2014 points in plane

Source: Chile Finals 2014 L2 p3

October 5, 2022
combinatoricscombinatorial geometrypoints

Problem Statement

In the plane there are 20142014 plotted points, such that no 33 are collinear. For each pair of plotted points, draw the line that passes through them. prove that for every three of marked points there are always two that are separated by an amount odd number of lines.