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Question
If A and B are finite sets such that A ⊂ B, then n (A ∪ B) = ______.
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Solution
If A and B are finite sets such that A ⊂ B, then n (A ∪ B) = n(B).
Explanation:
A ⊂ B
⇒ A ∪ B = B
⇒ n(A ∪ B) = n(B)
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