Math Chapter Wise Sets, Relations And Functions English MCQ DSSSB PGT 2021 Q.Which of the following is not true? AA ∩ B = B ∩ A BA ∪ B = B ∪ A CA ∪ (B ∪ C) = (A ∪ B) ∩ C DA ∩ A' = φ Show answer Correct answer: A ∪ (B ∪ C) = (A ∪ B) ∩ C