Khan/khan-exercises — pull request #42075 by jlcox5 (2013-03-04 18:58:55+00:00)
Title: Add Exercise: Marbles From a Bag (Probability)

Created a simple exercise for the marbles in a bag video. The number of colors can vary from 2 to 4, and the number of marbles of each color can vary from 1 to 4.