Pascal's Triangle in arithmetic modulo 4.
1 = green, 2 = brown, 3 = yellow, 4 = red. Year 7 (grade 6) students and up quickly get the idea of modular (clock) arithmetic, and can have fun colouring Pascal's Triangle to any modulus. Interesting patterns always emerge. It would make a good school Christmas Competition. This painted in watercolours, Paul Jackson Feb 2019
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