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

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

4 is WRONG. Application of the Boolean property x + x'y = x + y, where x = A + B + C, and y = D + E, gives the desired result.

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