Solution of problem N3821 probability theory total prob

Solution of problem N3821 probability theory total prob

3821. Casting in blanks comes from two preparation shops: 65% from the first and 35% from the second. At the same time, the material of the first workshop has 15% of defects, and the second - 25%. Find the probability that one blank at random is free of defects.

Additional information:

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)

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