Question: (a) If A B and A B , show that A = . (b) If A B and C D,

(a) If A ⊂ B and A ⊂ B̅ , show that A = ∅.

(b) If A ⊂ B and C ⊂ D, show that (A ∪ C) ⊂ (B ∪ D) and illustrate the result using a Venn diagram.

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