What's the probability someone has a stereo given they do NOT have a

C

Conner

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computer? READ FOR PROBLEM :)? There are 120 students, 60 said they have ONLY a stereo, 40 say they have ONLY a computer, and 15 said they had both. Thanks!
FYI, I am doing my homework. This was a 30 problem packet and my bad for not understanding how to do 2 of them. Gosh people.
 
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