MathDB

15

Part of 1992 IMO Longlists

Problems(1)

78 lines in plane that have 1992 points of intersection

Source:

9/1/2010
Prove that there exist 7878 lines in the plane such that they have exactly 19921992 points of intersection.
combinatoricsIntersectioncountingstraight linesIMO ShortlistIMO Longlist