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OpenStudy (anonymous):
A box is filled with 5 red cards, 3 brown cards, and 4 green cards. A card is chosen at random from the box. What is the probability that it is a red or a green card?
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OpenStudy (amistre64):
how many red or green cards are there? =s how many cards there there altogether? =n use the basic rule the defines a probability as the number of events defined to happen, divided by the number of total events that could happen:\[P(X)=\frac sn\]
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