OPM 2013 Problem 5
Liliana wants to paint a board. Liliana divides each unit square by one of its diagonals and paint one of the halves of the square with black and the other half with white in such a way that triangles that have a common side haven't the same colour. How many possibilities has Liliana to paint the board?
Dataset text AI-MO AoPS. Quoted with source.
Solutions
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