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Experiment–an activity or process that whose outcome is subject to uncertainty. That is, experiment lead to random outcomes. SampleSpace–the set of all possible outcomes of an experiment, denoted by S. Event–any collection (subset) of outcomes of interest denoted by a capital letter. Event is a subset of the sample space. Events can be simple (consists of exactly one outcome) or compound (consists of more than one outcomes). Complement of an event A–denoted by A’, is the event that A does not occur. A’= { x | x !∈A} Union of two events A and B–denoted by A∪B, is the event that either A or B occurs, or they both occur. That is, at least one of the events occur. A ∪B = {x | x ∈A or x ∈B} Intersection of two events A and B–denoted by A ∩ B, is the event that both A and B occur simultaneously. A ∩ B = {x | x ∈A and x ∈B} Null event–denoted by Ø, consists of no outcomes. Two events A and B are said to bemutually exclusiveor disjointif A ∩ B = Ø so that they have no outcomes in common.