6. Identify that function generated by the logic circuit shown.

  1. F = AB + C + D
  2. F = (A'+B')C'D
  3. F = A'B'+ C'+ D'
  4. F = (A+B)CD
  5. None of the above



3 is WRONG. Substitute the equivalent symbol for the rightmost NAND gate. You can then graphically read off the function generated by this circuit.

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