MathCastle
GeometrySuperchallengePoints, Lines & Planes

Points, Lines & Planes · Superchallenge problem

Consider the 2525 points (x,y)(x, y) with x,y∈{0,1,2,3,4}x, y \in \{0, 1, 2, 3, 4\}. How many distinct lines pass through at least two of these points?