10. Which of the following relationships represents the dual of the Boolean property x + x'y = x + y Choose the best answer.

  1. x'(x + y') = x'*y'
  2. x(x'y) = xy
  3. x*x' + y = xy
  4. x'(xy') = x'*y'
  5. x(x' + y) = xy

4 is WRONG.

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