1. For each of the following, determine whether it is valid or invalid. If valid then give a proof. If invalid then give a counter example.

A) A ⊆ B ⇒ COMPLEMENT OF B ⊆ COMPLEMENT OF A

B) B ∩ C ⊆ A ⇒ (C − A) ∩ (B − A) = ∅.

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