Most commercial color printing is achieved using three primary colors and black. these primaries are

The most commercial printing is being achieve through the three primary colors as well as the color black. The primary colors are then Cyan, Yellow and Magenta. Hope this is the right answer and would be of big help then.

Studying history is very important so that we learn from past experiences and don't repeat the bad ideas/choices that might have been made. it can tell us how cultures conducted their lives and you can learn about interesting facts you might not know. hope this ! : )