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