3711. Two punchers stuffed on the same set of punched cards. The probability that the first puncher makes a mistake is 0.1; for the second perforator, this probability is 0.2. An error was found during the reconciliation of punched cards. Find its probability and the probability that the first puncher made a mistake.
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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