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An urn contains 5 white and 10 black balls. A fair die is rolled and that numberof balls are randomly chosen from the urn. What is the probability that all of theballs selected are white? 

 Aug 1, 2020
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You have to look at each scenario separately and then add them all the probabilities that you get together.

 

P(1 thrown and 1 while all drawn) = 1/6 *  5/15

P(2 thrown and 2 while all drawn) = 1/6 *  5/15 * 4/14

etc

 
 Aug 1, 2020

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