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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