3683. Two automatic machines make identical details on the general conveyor. The performance of the first machine is three times the second. In addition, the first produces 72% of parts of excellent quality, the second - 82%. Find the probability that:
1) taken at random item of excellent quality;
2) and this item is made by the second machine.
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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