Probability Question: There are 120 people in a building. Among them 80 people have jobs, 60 people have certificates, and 40 people have jobs but don't have certificates. (a) If you randomly choose a person from the building, what is the probability that the person you choose has a job and also a certificate? (b) If you randomly choose a person from the building, what is the probability that the person you choose neither has a job nor a certificate?

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