2976. The first box contains 20 parts, 15 of which are

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2976. The first box contains 20 parts, 15 of which are standard; in the second - 30 parts, of which 24 are standard; in the third - 10 parts, of which 6 are standard. Find the probability that at random the extracted part from the randomly taken box is standard.

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

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