please explain

Now consider this truth table: Suppose you wanted to draw the corresponding characteristic table. For each pair of rows with the same values of A and B, you would need to come up with a formula for Q(t+1) in terms of Q(t) that works for each pair of rows. There are four possible answers: 0,1,Q(t) and Q(t). Here is the answer to this sample problem: 7. Here's another one so you can get some more practice