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1431. The probability that the lamp will burn after 1000 hours of operation is 0.8.
a) What is the probability that, after working 1000 hours, three out of five light bulbs will remain serviceable?
b) Find the probability that at least three of the five lamps remain functional (event A).
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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