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Four engineers: Anna, Brian, Cynthia and David are taking PEO exam. Let A denote event that Anna passed the exam, let B denote event

Four engineers: Anna, Brian, Cynthia and David are taking PEO exam. Let A denote event that Anna passed the exam, let B denote event that Brian passed the exam, let C denote event that Cynthia passed the exam and let D denote event that David passed the exam. Using set operations describe the following events: a) Nobody passed the exam b) Anna passed the exam c) Only one engineer passed the exam d) At least one engineer passed the exam

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