Hi. If I could get some clarification on the attached circuits that would be great. The question asks to find the boolean expression for C. I already know the answers, but I don't quite see how they got it. For the first circuit: C=A_bar The truth table looks like this: A C 0 1 1 0 This is where I'm getting completely lost. Isn't C basically connected to ground?? Wouldn't that mean C is always 0?