Fill in the blanks to make each of the following a true statement:
(i)
(ii) Φ′ ∩ A = …
(iii)
(iv)
(ii) Φ′ ∩ A = U ∩ A = A
∴ Φ′ ∩ A = A
(iii) A ∩ A′ = Φ
(iv) U′ ∩ A = Φ ∩ A = Φ
∴ U′ ∩ A = Φ
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