The Five Rings have been the official symbol of the Olympic Games since 1913. The five rings represent the five major regions of the world: Asia, Africa, Europe, Oceania and the Americas. The five different colors of the rings are blue, yellow, black, green and red. At least one of those five colors appears on every national flag in the world.
What is the general likelyhood that the color blue is present in at least one country's flag on each continent?
What percentage of the ring's colors can be found on the flag of the United States of America?