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Problem 121
Combinatorics Difficulty 1.0 Multiple choice CEMC Gauss (Grade 7) · Canada · 2026
In the diagram, how many of the shapes are triangles?

Official solution
In the diagram, there are 3
columns containing triangles that each contain 2 triangles.
So, there are 3×2=6
triangles.
Source: CEMC, University of Waterloo,
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