12. Simplification of the Boolean expression (A + B)'(C + D + E)' + (A + B)' yields which of the following results?

  1. A + B
  2. A'B'
  3. C + D + E
  4. C'D'E'
  5. A"B'C'D'E'

2 is CORRECT. By applying the property x + xy = x, with x = (A + B)'= A'B' and y = (C + D + E)'= C'D'E', we get the result.

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