Which of the following is NOT a primary color?

In the context of color theory, primary colors are those that cannot be created by mixing other colors together. The primary colors typically referenced in art and design are red, blue, and yellow. These colors serve as the foundation for creating a wide array of other colors when combined in various ways.

Green, on the other hand, is a secondary color formed by mixing blue and yellow together. This means that green is not a primary color, as it is derived from the combination of two of the three primary colors. Understanding this distinction is crucial for anyone studying color theory, as it lays the groundwork for more complex color mixing and the creation of color palettes.