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!
reach: rather globalartcolorspainting

Answers by country

black
yellow
red
blue
answers
flagthe United States
93%
1%
0%
4%
65
flagGreece
83%
0%
0%
16%
12
flagIndia
78%
13%
0%
8%
23
flagGermany
75%
7%
7%
9%
41
flagAustralia
75%
16%
0%
8%
12
flagPoland
72%
9%
4%
12%
4425
flagthe United Kingdom
58%
14%
8%
17%
34