A and B are two sets such that A⊆B. If n(A) = 3 and n(B) = 7, then n(AUB)?
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the answer is n(AUB) = 10
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n(AUB) = 7
because it is given that A is a subset of B it's mean all the members of A present in B. In union every element of the sets written only 1 times even when both of them have the same elements.
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