Truthtelling/Lying question (If B is lying then I'm lying) I'm stuck at a question about truthtelling/lying. Although similar problems have been posted I couldn't find a case similar to mine. 
So a person is either a truthteller or a liar. Let's say we have two persons A and B. If I ask A: Are any of you telling the truth and A responds "If B is lying then I'm lying" How do I know who if they, individually, are lying or telling the truth. The way I see it there are two solutions, but I'm guessing one of my answers is wrong. I think that either they are both telling the truth or that A is lying and B is telling the truth. 
I know that this can be set up with truth tables, but I'd like an explanation in words as to why and what I'm wrong about in my answer.

The last one is not true. If $B$ tells the truth, then the implication $A$ is stating is a true implication. Hence, $A$ told the truth. Do you understand?
