11. 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

3 is WRONG. In this special case, the "+" has higher precedent than the "*" between the x and x', so you need to use parenthesis with the x'+ y term before ANDing it with the x.

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