NASA estimates that the chance of a "critical-item failure" (that is, a catastrophic failure) within the U.S. Space Shuttles 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?