by LSAT-Chang Sun Jul 17, 2011 9:18 pm
So the question is basically asking us who could leave 2 messages on the answering machine (that being first and last).
(B) can't be right because then we would have H _ _ _ _ H. But our 3rd constraint tells us that if H is 1st, then P has to be 6th. So eliminate.
(C) can't be right because then we would have L _ _ _ _ L. We know from our 1st constraint that at most 1 person can leave more than 1 message, so that tells us that four other people need to leave messages (in total 5). But we can't have G since that would tag along all 6 people! So we know that it has to be F, P, T, H, L leaving messages. But if we have P, our last constraint tells us that all Hs has to come before Ls, so L can't be first!
(D) can't be right because then we would have P _ _ _ _ P. But following my explanation for (C), we would need an F, but that means that all Ps must come before Ts, and we know for sure that we need a T in the diagram, but where would it go? There is no space for T (it would be falling off).
(E) can't be right because then we would have T _ _ _ _ T. But the same rule applies as above. If we have F, we know that all Ps must come before Ts, but this time, where would the P go? There is no space to put the P.
Hope that helps!