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17-04-2017
Mathematics

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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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17-04-2017

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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