2977. The first box contains 20 parts, of which 12 are

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2977. The first box contains 20 parts, of which 12 are standard; in the second - 30, of which 16 are standard; in the third - 10 parts, of which 6 are standard. Find the probability that the extracted part from the selected box will be standard at random.

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

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