15. Simplifing (AB)' + A'B to most basic form yields which of the following expressions?

  1. A'
  2. B'
  3. A+B
  4. B
  5. (AB)'

5 is CORRECT. 

(AB)' + A'B = A'+ B' + A'B
            = A' + A'B + B' 
              -------
            =    A'     + B' by Absorption
            = (AB)' by DeMorgan's

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