When red and green combine, the result is yellow. When red and blue combine, the result is magenta. When blue and green combine, the result is cyan. Additive mixing is used in television and computer monitors to produce a wide range of colors using only three primary colors.
Likewise, people ask, what color do you get when you mix red and brown?
Orange which is made from mixing yellow and red then adding a little blue will make brown which makes it a tertiary colour. You can also make brown from green a secondary colour which is made from mixing blue and yellow and then red a primary colour which also makes it a tertiary colour.