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Bowl B1 contains two white chips,bowl B2 contains two red chips, bowl B3 contains two white chips and two red chips, and bowl B4 contains three white chips and one red chip. The probabilities of selecting bowl B1, B2, B3, or B4 are 1/2, 1/4, 1/8 and 1/8, respectively. A bowl is selected using these probabilities and a chip is then drawn at random. Find: P(W), the probability of drawing a white chip.
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