1. Which of the following relationships represents the dual of the Boolean property x + x' = 1? (Note: * = AND, + = OR)

  1. x'* x = 1
  2. x * x'= 1
  3. x + x'= 0
  4. x * x'= 0
  5. x'* x = 0

4 is CORRECT. The dual of any Boolean property may be obtained by interchanging all occurrences of the symbols (*,+,0,1) with the symbols (+,*,1,0). Complements are not affected.

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