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21. Suppose the failure rate of a jet engine is 2=10^(-3) per hour. What is the probability that more than two engines on a four-engine

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21. Suppose the failure rate of a jet engine is 2=10^(-3) per hour. What is the probability that more than two engines on a four-engine aircraft will fail during 4-hour flight? Assume that the failures are independent. (1 mark)

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