Question: Bob sets two alarm clocks (battery-powered) to be sure he arises for his Monday 8:00 a.m. accounting exam. There is a 75 percent chance that

Bob sets two alarm clocks (battery-powered) to be sure he arises for his Monday 8:00 a.m. accounting exam. There is a 75 percent chance that either clock will wake Bob.
(a) What is the probability that Bob will oversleep?
(b) If Bob had three clocks, would he have a 99 percent chance of waking up?

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