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Assuming the alternator's failures are unrelated, the probability of both failing is the product of the individual probability, or 0.022, or 0.0004. The duration of the flight does not matter.

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Q: The probability that a given alternator will fail on a 1-hour flight is 02 What is the probability that both will fail?
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A certain airplane has two independent alternators to provide electrical power The probability that a given alternator will fail on a 1-hour flight is 02 What is the probability that a both will fail?

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