3828. Casting in blanks comes from three workshops: 50% from the first, 30% from the second and 20% from the third. At the same time, the material of the first workshop has 8% of defects, the second 6% and the third 4%. Find the probability that at random the disc is free from defects.
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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