Why green color also comes in primary color in some books and even in photography and why not yellow?

In: Drawing
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It depends on wither you're adding colors or subtracting them.
Paints absorb all the colors except the one you see (i.e. red paint absorbs green, etc.),
so if you mix two paints they BOTH absorb color. So for paint it's: red,yellow, blue.
BUT
when you add light, like the phosphors in the screen that you're looking at right now, then to get white you must add red, green, and blue.

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