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A boiler has 4 relief valves which operate independently. The probability that each opens properly is 0.45. What is the probability that at least

A boiler has 4 relief valves which operate independently. The probability that each opens properly is 0.45. What is the probability that at least one opens properly? 0.9999 Jy 0.9590 0.9085 None of them 0.6836

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