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**a⋅b+c⋅d**is

**a'+b'⋅c'+d'**Yet both functions are 1 for ܾܽܿ abcd 1110. How can both a function and its complement be 1 for the same input combination? What’s wrong here?

I honestly have no idea. I mean, shouldn't all complements be the inverse? This is the first question that stated otherwise and it really confuses me.