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OpenStudy (anonymous):

In a large bag of marbles, 25% of them are red. A child chooses 4 marbles from this bag. If the child chooses the marbles at random, what is the chance that the child gets exactly three red marbles?

OpenStudy (anonymous):

Well how many possible ways can 3 out of 4 marbles be red? RRRR', RRR'R, RR'RR, R'RRR i.e. 4 4 * 0.25^3 * 0.75 = 0.046875

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