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A box contains a collection of marbles, all identical except for color. Each marble is either black, red, or white. If a marble is randomly drawn from the box, what is the probability that the marble is white? (1)The box contains 120 marbles. (2)There are twice as many black marbles as white marbles in the box.

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A box contains a collection of marbles, all identical except for color. Each marble is either black, red, or white. If a marble is randomly drawn from the box, what is the probability that the marble is white? (1)The box contains 120 marbles. (2)There are twice as many black marbles as white marbles in the box.






 
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