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Originally Posted by Gus Mango Fish
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.
In spherical geometry (e.g. not using Euclidean straight lines) the angles of a triangle add up to more than 180 degrees.
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Is the subtext of this that you know a way of beating roulette, or that we should remain agnostic regarding its possibility?
Either way, practically plagiarising off Wikipedia doesn't constitute providing good counter-examples. When I referred to triangles I was referring to them in a Euclidean context, and when I referred to primary colours I was referring to them in an art-based context, outside the scientific field of light wavelengths.
One could just as easily refer to a Wikipedia entry on roulette that says there's a way to beat it which includes being very lucky.