Question

Which of the following statement is true? 

(A) A ∩ B = Φ ⇒ A = Φ and B = Φ 

(B) A – B = Φ ⇒ A ⊂ B 

(C) A ∪ B = Φ ⇒ A ⊂ B 

(D) None of these

Answer 1

Answer is (A) A ∩ B = Φ ⇒ A = Φ and B = Φ

Because in A ∩ B = Φ, Φ is common in A and B.