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Cheapo brand alarm clocks have a 85% probability of working. Nervous Nelly has a big job interview tomorrow morning and is setting two Cheapo brand

Cheapo brand alarm clocks have a 85% probability of working. Nervous Nelly has a big job interview tomorrow morning and is setting two Cheapo brand alarm clocks. As long as one of them goes off, she'll wake up on time. What is the probability that Nervous Nelly wakes up on time

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