5 distinct points and 5 distinct lines are given in the plane
Source: Czech And Slovak Mathematical Olympiad, Round III, Category A 1995 p3
February 20, 2020
combinatorial geometrycombinatorics
Problem Statement
Five distinct points and five distinct lines are given in the plane. Prove that one can select two of the points and two of the lines so that none of the selected lines contains any of the selected points.