Leta, b, and C be sets. Show that
a) (A ∪ B) ⊆ (A ∪ B ∪ C).
b) (A ∩ B ∩ C) ⊆ (A ∩ B).
c) (A – b) – C ⊆ A – C.
d) (A – C) ∩ (C – B) = ∅.
e) (B – A) ∪ (C – A) = (B ∪ C) – A.
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