Will A and B always be the complement of one another regardless of what logic gates we use in the latch-like circuit? For instance (the two circuits shown as examples):
How do we decide whether A and B will be the complement of one another or not?
How to find the invalid states?
Are these two latches?
I have tried following a few videos for instance this. But the presenter says that a certain state is invalid because Q and Q' should be the complement of each other. But how do we decide/prove that Q and Q' are the complement of one another?
Truth Table of First Circuit:
How do I derive answers to the above questions from here.