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An instructor gives his class a set of 10 problems with the information that the next quiz will consist of a random selection of 3

An instructor gives his class a set of 10 problems with the information that the next quiz will consist of a random selection of 3 of them. If a student has figured out how to do 8 of the problems, what is the probability the he or she will answer correctly

(a) all 3 problems?

(b) at least 2 problems?

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