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March 3, 2015

March 3, 2015

Posted by **James** on Monday, July 11, 2011 at 8:26pm.

- MATH -
**Max**, Monday, July 11, 2011 at 8:32pmFirst, let's consider the probability that none of the balls are red, or all of them are blue. There are 9 balls, 4 of which are blue. So the chance that 3 blue balls will be chosen is 4/9 * 3/8 * 2/7, or 1/21. You can do the rest from here.

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