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Mexico Contests
Mexico National Olympiad
1989 Mexico National Olympiad
6
6
Part of
1989 Mexico National Olympiad
Problems
(1)
no of paths in a triangular grid
Source: Mexican Mathematical Olympiad 1989 OMM P6
7/27/2018
Determine the number of paths from
A
A
A
to
B
B
B
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
combinatorics
grid