There are no colors that can be combined to achieve the color yellow. Yellow is a primary color. By definition, a primary color is a hue that cannot be created by mixing any other colors together.
There are three primary colors: red, blue and yellow. Primary colors are the building blocks of all other colors. Secondary colors are colors that can be created by mixing just primary colors. These include orange, purple and green.
The color yellow is often associated with the emotion of joy and happiness. It has a warming effect on moods and is the color of sunshine.