Question: Two methods, A and B are available for teaching a certain industrial skill. The failure rate is 20% for A and 10% for B. However

Two methods, A and B are available for teaching a certain industrial skill. The failure rate is 20% for A and 10% for B. However B is more expensive and hence is used only 30% of the time. A worker is taught the skill by one of the methods but failed to learn it correctly. What was the probability that she was taught by the method A?

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