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There are two main types of color mixing: additive color mixing and subtractive color mixing. Additive color mixing is creating a new color by a process that adds one set of wavelengths to another set of wavelengths. Additive color mixing is what happens when lights of different wavelengths are mixed.
Robert and David have it correct if you adding light (additive model). But if you are mixing paint (subtractive model) you will get a grayish brown color called a chromatic neutral. Black paint is arrived at by using a black pigment like carbon.