MathDB
no of triangles in a 3x3 grid (by 9 points) (HOMC 2016 J Q7)

Source:

August 7, 2019
combinatoricscombinatorial geometrygrid

Problem Statement

Nine points form a grid of size 3×33\times 3. How many triangles are there with 33 vertices at these points?
Back to ProblemsView on AoPS