6. Simplification of the Boolean expression AB + ABC + ABCD + ABCDE + ABCDEF yields which of the following results?

  1. ABCDEF
  2. AB
  3. AB + CD + EF
  4. A + B + C + D + E + F
  5. A + B(C+D(E+F))

4 is WRONG. You are not simplifying correctly. HINT: apply the absorption theorem x + xy = x to this expression.

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