no of paths in a triangular grid
Source: Mexican Mathematical Olympiad 1989 OMM P6
July 27, 2018
combinatoricsgrid
Problem Statement
Determine the number of paths from to on the picture that go along gridlines only, do not pass through any point twice, and never go upwards?
https://cdn.artofproblemsolving.com/attachments/0/2/87868e24a48a2e130fb5039daeb85af42f4b9d.png