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NASA estimates that the chance of a "critical-item failure" (that is, a catastrophic failure) within the U.S. Space Shuttle's main engines is 1 in 63 for each mission.

a) What is the probability that at least one of the eight shuttle missions scheduled next year results in a critical-item failure?

b) What is the probability that at least one of the 40 shuttle missions scheduled over the next 5 years results in a critical-item failure?

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