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15 November, 12:27

A bag contains 11 black and 21 gray marbles. A marble is drawn at random. What is the theoretical probability of NOT drawing a gray marble?

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  1. 15 November, 13:23
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    The probability of not drawing a grey marble is equal to the probability of drawing a black marble ...

    Probability=number of specific outcomes/total number of possible outcomes ...

    P (B) = 11 / (11+21)

    P (B) = 11/32
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