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OpenStudy (theflash21):
In a group of 55 people, 33 are coffee drinkers and 12 are tea drinkers. Assuming that no one in this group drinks both tea and coffee, what is the probability that a person picked at random from the group does not drink tea or coffee?
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OpenStudy (benji):
Coffee or tea drinkers = 45 So those that don't drink either = 10. What do you think you do next?
OpenStudy (mathmale):
Hint: what fraction of these 55 people drink neither tea nor coffee?
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