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13 December, 10:43

A bag contains 4 red marbles and 6 blue marbles. Brandon selects one marble from the bag. Without replacing the marble he then selects a second marble. What is the probability that he first selects a blue marble and then selects a red marble?

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  1. 13 December, 13:45
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    4 red marbles and 6 blue marbles ... total of 10 marbles

    probability of first marble being blue = 6/10

    without replacing

    probability of second marble being red = 4/9

    probability of both events happening = 6/10 * 4/9 = 24/90 reduces to 4/15
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