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Mathematics 7 Online
OpenStudy (anonymous):

imagine you have bag filled with 10 pink marbles and 5 black marbles. what is the probability of pulling a black marble from the bag?

OpenStudy (mathstudent55):

The probability is the number of desired outcomes divided by the total number of outcomes. Since any of the black marbles will do, there are 5 desired outcomes. The total number of outcomes is the number of marbles, 10 + 5 = 15.

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