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

- A'
- B'
- A+B
- B
- (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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