3824. Casting in blanks comes from two preparation shops: from the first shop - 70%, from the second shop 30%. Casting of the first workshop has 10% of the marriage, casting from the second - 20% of the marriage. Taken at random, the disc turned out to be without defect. What is the probability of its manufacture the first shop?
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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