Posted by john on Friday, March 25, 2011 at 3:46pm.
A candy dish contains 10 red, 10 orange, and 10 black gumdrops. A second dish contains exactly the same assortment. If you select a gumdrop from each dish, what are the chances that you will get two of the same color??

math  Reiny, Friday, March 25, 2011 at 5:05pm
let's do the prob of 2 red
= (10/30)(10/30) = 1/9
the same is true for each of the other two colours
so prob(2 of the same colour) = 3(1/9) = 1/3

math  Henry, Friday, March 25, 2011 at 10:36pm
John, check your 32311, 10:56am post.
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