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Originally Posted by Dice Man
That there isnt a way to beat roulette is as clear to see as the fact that there isn't a fourth primary colour
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Primary colours don't exist - they are either imagined, or at best imperfect. e.g. Tetrachromats (birds, marsupials, some women) can see 4 primary colours (birds, marsupials can see in ultraviolet, whereas some women have an additonal colour receptor for yellow.)
The ability to sense colours is down to individual biology. Hence for some people there are 4 primary colours, and for others 3. For most mammals (excluding the great apes) there are only 2 primary colours.
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Originally Posted by Dice Man
... or that there isn't a triangle with anything other than 180 degrees.
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In spherical geometry (e.g. not using Euclidean straight lines) the angles of a triangle add up to more than 180 degrees.