Math Chapter Wise Sets, Relations And Functions English MCQ OPSC PGT 2017 Q.For every pair of elements a and b, DeMorgan's laws in Boolean algebra are: A(a b) a b &(a b) a b/* * B(a b) b a &(a b) b a/* * C(a b) a b &(a b) a b/* * * D(a b) a b & (a b) a b * * Show answer Correct answer: (a b) a b &(a b) a b/* * *