A manufacturer of smartphones buys integrated circuits from suppliers A, B, and C; 50% from A, 30% from B, and

A manufacturer of smartphones buys integrated circuits from suppliers A, B, and C; 50% from A, 30% from B, and 20% from C. In the past, 1% of circuits supplied by A, 3% supplied by B, and 4% supplied by C have been defective. A circuit is selected at random and found to be defective. What is the probability that it came from supplier B

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