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The time between failures of a laser in a cytogenesis machine is exponentially distributed with a mean of 25,000 hours.

(a) What is the expected time until the second failure?

(b) What is the probability that the time until the third failure exceeds 50,000 hours?

(a) What is the expected time until the second failure?

(b) What is the probability that the time until the third failure exceeds 50,000 hours?

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