On a safe there are four alarms which are arranged so that any one will sound when
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On a safe there are four alarms which are arranged so that any one will sound when someone tries to break into the safe. The probability that each alarm will function properly is 0.85, find the probability that at least one alarm will sound when someone tries to break into the safe.
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Related Book For 
A Concise Course In Advanced Level Statistics With Worked Examples
ISBN: 9780748754755
4th Edition
Authors: J. Crawshaw, J. Chambers
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