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Evaluation employees of a firm receive annual reviews. In a certain department, 4 employees received excellent ratings, 15 received good ratings, and 1 received a marginal rating. If 3 employees in this department are randomly selected to complete a form for an internal study of the firm, find the probability that

(a) all 3 selected were rated excellent.
(b) one from each category was selected.

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Computer Engineering, Engineering

Category:- Computer Engineering
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