5. A 3-line to 8-line decoder is connected as shown, where x, y, and z are inputs (z is the least significant input digit) and F is an output. F = 1 when

  1. All 3 inputs are logical 0
  2. 2 out of 3 inputs are logical 0
  3. 1 out of 3 inputs are logical 0
  4. No input is logical 0
  5. None of the above

3 is CORRECT. Examining the truth table for output F = SUM m(3,5,6), it may be seen that F will equal a logical 1 when any 1 out of the 3 inputs are logical 0.

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