Let sample space, S = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}. Let us define the following events A: "set of numbers divisible by 2". B: "set of numbers divisible by 3". Then what should be the event C such that events A, B and C are mutually exhaustive?
A
{1, 6, 9}
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B
{1, 5, 7}
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C
{7, 0, 5}
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D
{4, 8, 9}
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Solution
The correct option is B {1, 5, 7} A = {2, 4, 6, 8, 10} B = {3, 6, 9} ⇒A∪B={2,3,4,6,8,9,10} Events A, B and C are mutually exhaustive when A∪B∪C=SSo,C=S−(A∪B)Therefore,C={1,5,7}