Combining equal amounts of blue and green produces the colour Cyan.
Cyan is one of the three secondary colours in the additive RGB colour model.
RYB is the subtractive model of primary colours, which consists of red, yellow, and blue. These hues cannot be produced by mixing with other hues. All colours are created by combining the three primary hues.
Mixing equal amounts of adjacent pairs of primary colours yields secondary hues. Orange, violet, and green are the secondary colours. The tertiary colours are produced by mixing the secondary colours.