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Probability: Urn containing balls - without replacement problems

An urn contains 8 balls identical in every respect except color. There are 4 blue balls, 3 red balls, and 1 white ball.

a) If you draw one ball from the urn what is the probability that it is blue or white?
b) If you draw two balls without replacing the first one, what is the probability that the first ball is red and the second ball is white?
c) If you draw two balls without replacing the first one, what is the probability that one ball is red and the other is white?

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