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)'

2 is WRONG. You applied DeMorgan's theorem incorrectly!

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