Math for the middle school and elementary teacher
posted by liz .
3 red balls, 4 green balls, and 5 yellow balls are in a bag. If 2 balls are drawn randomly (without replacement) find the probability that the balls are different colors.
I got 47/66 that the balls are different colors...is that right?
Probability to draw two of same colour
Probability to draw two of different colours
http://www.futureaccountant.com/probability/problems-solutions/drawing-picking-selecting-two-three-more-balls-box-bag-urn-04.php and many variations of the same bag.
Thank you very much for you help:)