Solving problem N3715 Bayesian probability theory

Solving problem N3715 Bayesian probability theory

3715. Two operators filled in the same set of punched cards. The probability that the first operator makes a mistake is 0.1; for the second operator, this probability is 0.2. An error was found when checking the punched cards. What is the probability that the first statement was wrong?

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Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)

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