Chisinau MO p58 1949-56 X no of lines, m points out of n points
Source:
March 15, 2021
geometrycombinatorial geometrycombinatoricspointslines
Problem Statement
On the plane points are chosen so that exactly of them lie on one straight line and no three points not included in these points lie on one straight line. What is the number of all lines, each of which contains at least two of these points?