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A manufacturer obtains​ clock-radios from three different​ subcontractors, 30​% from Upper B 1​, 10​% from Upper...

A manufacturer obtains​ clock-radios from three different​ subcontractors, 30​% from Upper B 1​, 10​% from Upper B 2​, and 60​% from Upper B 3. The defective rates for​ clock-radios from these subcontractors are 5​%, 3 %​, and 1​% respectively. If a defective​ clock-radio is returned by a​ customer, what is the probability that a defective​ clock-radio came from subcontractor Upper B 1​?

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