4. Given the function F(A,B,X,Y) = AB + X'Y, the most simplified Boolean representation for F' is

  1. (AB)' + (X'Y)
  2. A'*B' + XY'
  3. (A'+ B')(X + Y')
  4. (AB + X'*Y)'
  5. (AB)'(X'*Y)'

5 is WRONG. Correct, but DeMorgan's theorem needs to be applied to each remaining term also! to further simplify the expression.

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