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3958. Electric bulbs are manufactured in two factories, 2019

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Description

3958. Electric bulbs are manufactured in two factories, the first producing 60% of the total, the second 40%. The production of the first plant contains 70% of the lamps of the highest grade, the second - 80%. The store receives products from two factories. The purchased lamp was not the highest grade. Find the probability that this lamp is made at the first factory.

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Additional information

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

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