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OpenStudy (anonymous):
A bag has four green marbles, three red marbles, and three yellow marbles. What is the probability that you pick a red marble, do not replace it, and pick a yellow marble?
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OpenStudy (amistre64):
\[\frac{r}{m}*\frac{y}{m-1}\]
OpenStudy (amistre64):
where m is the number of marbles to begin with .... and r and y are the number of red, yellow ones
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