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                   12) What is a logic gate? What are the basic types of logic gate?
                   13) Draw truth table for

                        a.  AB' + B'C
                        b.  PQ+QR'+P'QR

                   14) Prove using truth table:
                        a.  AB' + B'C = A+C

                        b.  XY' + X'Y' + Y'Z = Y'

                   15) Draw circuit diagram for
                        a.  AB' + AB'C

                        b.  U + (V'+W')+ UV'W
                   16) State and prove Demorgan’s theorem using Truth table.

                   17) Which gates are known as universal gates and why?
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