In Boolean algebra, I need to prove that $AB+AB'C+BC'=AC+BC'$ and $(ABC)'(A+B+C)=A'B'C'$
Are both the questions correct?
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No, both questions are not correct.
The first statement is a tautology. You can prove it.
The second statement is not a tautology. You can prove it is not always true. (via counter example)
Graham Kemp
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