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Finite probability question

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An urn contains six red balls, five black balls, and four green balls. If two balls are selected at random without replacement from the urn, what is the probability that a red ball and a black ball will be selected?

Oct 7th, 2014

 probability that a red ball and a black ball will be selected=6/15*5/14

                                                                                           =2/5*5/14

                                                                                           =1/7

Oct 7th, 2014

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Oct 7th, 2014
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Oct 7th, 2014
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