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There are three workstations available having steady-state probabilities of 0.99, 0.95, 0.85 of being available on...

There are three workstations available having steady-state probabilities of 0.99, 0.95, 0.85 of being available on demand. What is the probability that at least two of the three will be available at any given time?

Hint: calculate the P(all three being available)+P(two of them being available: A&B and not C, A&C and not B, or B&C and not A)

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