Spoiler for 2a 2b 3 4
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Posted 10 July 2013 - 09:22 PM
Spoiler for 2a 2b 3 4I think you can do infinite colors, take the unit circle and paint it's circumference with as many colors as you like, the rest of the plane paint blue, now any straight line could intersect with the circle in exactly 0 1 or 2 points, so the maximum number of different colors is 3.
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