What are the primary colors?

Red, Yellow, Blue

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Colour Theory Tutorial - Watercolours and Pastels by Peter Saw (http://website.lineone.net/~peter.saw/lessons/colour.htm)
"There are three Primary colours: RED, YELLOW and BLUE. Primary colours cannot be created by mixing other colours."

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Yes, red, yellow and blue - normally for a student's understanding. However, what the primary colors are can also be dependent on the application or process for which they are used. The quote below is from the following site. Primary color - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Primary_colors)



Primary colors are sets of colors (http://en.wikipedia.org/wiki/Color) that can be combined to make a useful range (gamut (http://en.wikipedia.org/wiki/Gamut)) of colors. For human applications, three are often used; for additive combination of colors, as in overlapping projected lights or in CRT (http://en.wikipedia.org/wiki/Cathode_ray_tube) displays, the primary colors normally used are red (http://en.wikipedia.org/wiki/Red), green (http://en.wikipedia.org/wiki/Green), and blue (http://en.wikipedia.org/wiki/Blue). For subtractive combination of colors, as in mixing of pigments or dyes, such as in printing, the primaries normally used are magenta (http://en.wikipedia.org/wiki/Magenta), cyan (http://en.wikipedia.org/wiki/Cyan), and yellow (http://en.wikipedia.org/wiki/Yellow).[1] (http://en.wikipedia.org/wiki/Primary_colors#cite_note-0)
Any choice of primary colors is essentially arbitrary; for example, an early color photographic process, autochrome (http://en.wikipedia.org/wiki/Autochrome_Lumi%C3%A8re), typically used orange (http://en.wikipedia.org/wiki/Orange_%28color%29), green (http://en.wikipedia.org/wiki/Green), and violet (http://en.wikipedia.org/wiki/Violet_%28color%29) primaries.[2] (http://en.wikipedia.org/wiki/Primary_colors#cite_note-1)