1. Three factories produce printers to supply the market. Factory A produces 25% of printers are produced in A, 45% of the printers are produced by factory B and 35% in factory C. 3% of the printers produced in factory A are defective, 2% of the printers produced in factory B are defective and 4% of the printers produced in factory C are defective. A printer is selected at random in the market and found to be defective, what is the probability that this bulb was produced by factory C?

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