Redundancy Using battery-powered alarm clocks, it is estimated that the probability of failure on any given day

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Redundancy Using battery-powered alarm clocks, it is estimated that the probability of failure on any given day is 1>1000.

a. What is the probability that the alarm clock works for an important event?

b. When using two alarm clocks for an important event, what is the probability that at least one of them works?

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