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A computer reserves a path in a network for 10 minutes. To extend the reservation the computer must successfully send a refresh message before the

A computer reserves a path in a network for 10 minutes. To extend the reservation the computer must successfully send a "refresh" message before the expiry time. However, messages are lost with probability p = 0.1 Suppose that it takes 10 seconds to send a refresh request and receive an acknowledgment. When should the computer start sending refresh messages in order to have a 95% chance of successfully extending the reservation time?

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