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7. There are five machines A, B, C, D and E used in a manufacturing process. In order for the process to work, either A or B must operate and at least two of C, D and E must operate. Machines A and B each operate 92% of the time and machines C, D and E each operate 89% of the time, what is the probability that the process will work if the likelihood of each machine operating is independent of the other four?
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