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An urn contains 12 numbered balls, of which 6 are red, 3 are white and 2...

An urn contains 12 numbered balls, of which 6 are red, 3 are white and 2 are black. Andy randomly selects one ball from the urn. He gets $3.00 if he selects a black ball, and gets $1.00 if he selects a white ball. He gets nothing if he selects a red ball. What is the expected value of the money he gets?
Math   Statistics-And-Probability   
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