Homework Help: Math

Posted by Tim on Saturday, October 1, 2011 at 2:39am.

There are 20 balls in a bowl. 7 black, 6 blue, 5 green, 4 red, and 3 yellow. Balls must be drawn until 4 different colors are drawn. What is the probability that one is black?

Please walk me through if you can...

Math - Tim, Saturday, October 1, 2011 at 2:41am
Edit...25 balls in the bowl..

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