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If A ⊂ B, then A ∩ B = A ∪ B. always sometimes never
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If A ⊂ B, then A ∩ B = A ∪ B. always sometimes never

User Ezra Obiwale
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Sometimes. The following figure shows.
If A ⊂ B, then A ∩ B = A ∪ B. always sometimes never-example-1
User Wliao
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