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

- ABCDEF
- AB
- AB + CD + EF
- A + B + C + D + E + F
- 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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