When blue and yellow are combined, the resulting colour is green.
Red, blue, and yellow are referred to as the primary colours. These are the only three colours that cannot be created by combining other hues.
The primary colours, along with black and white, can produce the entire spectrum of colours.
Green is a complementary hue. Secondary colours can be created by combining two of the primary colours. Orange and violet are two additional secondary hues. The hues of secondary colours are midway between the hues of the two primary colours from which they are derived.
A colour wheel is used to demonstrate the relationship between colours.