Page 72 - Computer science 868 Class 12
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Example 2: Draw the logic circuit diagram of the following Boolean expression (A'+B'+C')+A.B.
              Ans. The gates will be (A NAND B NAND C) OR (A AND B) or (A' OR B' OR C') OR (A AND B).
              The first one is drawn below:

                                         A                   A'+B'+C'
                                         B
                                         C
                                                                                 (A'+B'+C') + A.B


                                                             A.B



              Example 3: Draw the logic circuit diagram of the following Boolean expression ((A'+B+C).(B+C'))'.
              Ans. The gate sequence will be (A' OR B OR C) NAND (B OR C').
                                       A'                    (A'+B+C)
                                       B
                                       C
                                                                                 ((A'+B+C).(B+C'))'





                                       C'                       (B+C')

              Example 4: Derive the Boolean expression of the following logic circuit.

              Ans.
                   A                                      A               A'.B+A.B'
                   B                                      B
                                                                                            (C.(A'.B+A.B'))'
                   C                                      C


              Example 5: Derive the Boolean expression of the following logic circuit.
              Ans.
                                             A
                                            B





                                            C



                                         A                  A'.B'+A.B
                                         B
                                                                              (A'.B'+A.B).(B+C)'




                                         C                 (B+C)'









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