There are 3 jars containing two types of round marbles. One
jar contains only red marbles, one jar contains only blue
marbles and the third jar contains a mix of both red and
blue marbles. Although the jars are labeled “red”, “blue”
and “mixed” – all the jars are mislabeled. How many marbles
would you have to pull out, and out of which jars, to find
out how to fix the labels correctly?