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Mathematics, 12.08.2019 17:30 gissell30

On a store counter are exactly two boxes containing only purple marbles and yellow marbles. box a has 30 purple marbles and 20 yellow marbles; box b has 15 purple marbles and 35 yellow marbles. if melanie randomly selects one of the boxes and then randomly selects one marble from that box, what is the probability that the marble selected will be purple?

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