I thought I'd register just to ask have you guys actually done art or physics since most of you have got a least part of it wrong.
When it comes to light, colours are mixed in an addative method
Magenta (red and blue)
Cyan (green and blue)
Yellow (red and green)
When it comes to solid/paint/ink, colours are mixed subtractively:
Solid (paint) colours:
Red (yellow and magenta)
Green (yellow and cyan)
Blue (cyan and magenta)
The whole idea of Red, yellow and blue primaries was brought about to simplify things mainly for teaching, hence why in school you will have initially been taught that.