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Question

If the cardinality of two disjoint sets A and B are 10 and 15 respectively, what is the cardinality of A B?


Solution

n(A) = 10

n(B) = 15

As A and B are disjoint sets, A B =

n(A  B) = n(A) + n(B)

                = 10 + 15

                = 25

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