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The probability that machine A will be performing a usual function is 5 years' time is (1/4), while the probability that machine B will still

The probability that machine A will be performing a usual function is 5 years' time is (1/4), while the probability that machine B will still be operating usefully at the end of same period is (1/3). Find the probability that in five years' time

a. Both machines will be performing a usual function.

b. At least one of the machines will be operating.

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