Which one is not a primary color?

black
yellow
red
blue
Elementary art education materials, dictionaries, and electronic search engines often define primary colors effectively as conceptual colors (generally red, yellow, and blue; or red, green, and blue) that can be used to mix "all" other colors.
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Very interesting!
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Answers by country

black
yellow
red
blue
answers
flagPoland
72%
9%
4%
12%
3703
flagGermany
36%
18%
27%
18%
11