An urn contains 7 red, 3 white, and 6 black balls. One ball is drawn from the urn, it is replaced, and a second ball is drawn. Construct a probability tree to determine the probability that one ball is white W and one is red R. Pr(one W none R) = 3 50 21 Pr(one W none R) = 128 21 Pr(one Wn one R) = 256 7 = 75 Pr(one Wn one R) 2 Pr(one W none R) = 25

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