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Suppose that there are 2 red balls, 2 blue ball, and 1 white balls in an...

Suppose that there are 2 red balls, 2 blue ball, and 1 white balls in an urn. A ball is drawn and its color is noted. After the ball is drawn, it is set aside and is replaced with a blue ball. Another ball is then drawn from the urn.

Find the probability the first ball drawn was red given that the second ball drawn was blue.

Whenever i post questions like these I tend to get given the wrong answer. Please notice that it says "GIVEN THAT"

Math   Statistics-And-Probability   
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