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3822. Casting in blanks comes from two preparation shops: 75% from the first and 25% from the second. At the same time, the material of the first workshop has 15% of defects, and the second - 20%. Taken at random, the disc was standard. Find the probability that it was made the first shop.
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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