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For all sets A and B, (A – B)∪ (A∩ B) = ...

For all sets A and B, (A – B)∪ (A∩ B) = A. Is this statement true?

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  19. For all sets A and B, (A – B)∪ (A∩ B) = A. Is this statement true?

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  20. For all sets A, B and C, if A⊂ C and B ⊂ C,then A∪ B ⊂ C.

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