B 4 B 41: Simplify the following expressions using Boolean algebra. (a) x = ABC + AC (b) y (Q + R)(Q + R) Answers to problems marked with an asterisk can be found in the back of the text. CHAPTER 4/COMBINATIONAL LOGIC CIRCUITS (c) w = ABC + ABC + (d) q = RST(RT STT) (e) x =ABC + ABC + ABC + ABC + ABC (f) Z = (B+2)(B + C) +A+B+C (g) y = (CTD) +ACD + ABC+ABCD + ACD (h) x = AB(CD) + ABD + BCD