Question: Suppose that when both machines are down in Exercise 20 a second repairperson is called in to work on the newly failed one. Suppose all

Suppose that when both machines are down in Exercise 20 a second repairperson is called in to work on the newly failed one. Suppose all repair times remain exponential with rate . Now find the proportion of time at least one machine is working, and compare your answer with the one obtained in Exercise 20.

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