3. A Web site contains here identical computer servers. Only one is used to operate the site, and the other two are spares that can be activated in case the primary system fails. The probability of failure in the primary computer (or any activated spare system) from a request for service is 0.0005. Assuming that each request represents an independent trial, .. a. What is the probability that all three servers fail within five requests? b. What is the probability that a server fail within first request?

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