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A factory A produces 10% defective valve...

A factory A produces 10% defective valves and another factory B produces 20% defective valves. A bag contains 4 valves of factory A and 5 valves of factory B. If two valves are drawn at random from the bag, find the probability that at least one valve is defective.

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A DAS GUPTA-Total Conditional Probability and Bayes' Theorem-Exercise
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