ROY.G.BIV. Means red,Orange,Yellow,Green,Blue,Indigo,Viloet. It .is the initial light spectrum that makes up white light
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Black and whtie are not in ROYGBIV.... The sequence is: Red Orange Yellow Green Blue Indigo Violet, no black or white.
The arrangement of the spectral colors are determined by how the human eye and brain work. There is no clear reason to believe that different people or animals see the spectrum the same. In fact it is easy to show that they don't.
No, but sometimes "average" means "mean" - when it doesn't mean median, geometric mean, or something else entirely.
The answer will depend on who you mean by HE.The answer will depend on who you mean by HE.The answer will depend on who you mean by HE.The answer will depend on who you mean by HE.
See mean-8. Or get a dictionary.