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Mathematics 10 Online
OpenStudy (anonymous):

There are 40 people in a room. 23 are wearing jeans, 17 are wearing a T-shirt, and 12 are wearing both jeans and a T-shirt. If a person is selected at random, then find out the probability that they are wearing jeans, but not a T-shirt. Answer in fraction form. I don't even know where to begin with this because my answers aren't coming up as fractions. Can you help me set it up?

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