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A boiler has three independent safety valves which open and let steam off to the atmo-sphere...

A boiler has three independent safety valves which open and let steam off to the atmo-sphere in case of a high-pressure buildup. The boiler is considered to be safe if at least two valves open in the case of a high-pressure buildup. If the probability of each valve opening in case of high-pressure buildup is 0.9, find the probability of the boiler to be the safe condition in case of a high pressure buildup
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