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An urn contains 5 green balls and 8 red balls. One of the balls is drawn...

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Statistics

An urn contains 5 green balls and 8 red balls. One of theballs is drawn at random.
The drawn ball is returned to the urn with 3 additional ballsof the same color. A second
ball is drawn from the newly constituted urn.
a. What is the probability the second ball is green?
b. Given that the second ball was red, what is the probabilitythat the first ball was green?

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