# If A and B are finite sets such that A ⊂ B, then n (A ∪ B) = ______________.

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If A and B are finite sets such that A ⊂ B, then n (A ∪ B) = ______________.

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n(B)

A ⊂ B ⇒ A ∪ B = B

⇒ n(A  B) = n(B)