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*Sample Space = {1, 2, 3, 4, 5, 6}.*

*A: ‘a number less than 4 appears’,*

*B: ‘a number greater than 2 but less than 5 appears’*

*and*

*C: ‘a number greater than 4 appears’.*

*Then A = {1, 2, 3}, B = {3,4} and C = {5, 6}.*

*We see,*

*Union of the three sets, gives,*

*A ∪ B ∪ C = {1, 2, 3} ∪ {3, 4} ∪ {5, 6} = S.*

*Such events A, B and C are called exhaustive events.*

*EVENTS are said to be EXHAUSTIVE if atleast one of them necessarily occurs whenever the experiment is performed.*