Question: A computer store has 13 personal computers. A buyer wants to purchase 3 of them. Unknown to either the retail store or the buyer, 3

A computer store has 13 personal computers. A buyer wants to purchase 3 of them. Unknown to either the retail store or the buyer, 3 of the computers in stock are defective. Assume computers are selected at random. Question: if at least one of the computers selected is defective, what is the probability that the first computer is defective

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