by StephanieS945 Fri Jul 06, 2018 3:47 pm
Hi, hope I can help the understanding here.
The question asks for "Could be true EXCEPT" so we know the four wrong answer COULD be true. A quick scan of the answer choices shows that we are being asked to determine "Could be true" in relation to the Confess/Not Confess. The right answer is therefore will be someting defined[i][/i] in the diagram, so we want to keep our eye out for elements or positions that their confess/not confess status is determined.
A: Could be true. T could have confessed or could not have--we don't know and no new information lets us know the answer.
B: Could be true. Same reason as choice A, we don't know if T did or didn't confess!
C: Could be true. V can go in possitions 4 or 5. If V went into position 4, we know they did not confess. However, since V is interchangeable with X, it could go in 5. Therefore, V could have confessed!
D: Could be true. Since X is interchagneable with V, its easy to see based on the same logic as answer choice C that X could have confessed (if in position 5) or could have not confession (if in position 4).
E: Must be false! Bingo. The question gives us more information "Z was the second suspect ot confess". Ok, What does that tell us? Well, since we know Z can only be in positions 1 or 2 (since X & V must go after Z), then we know Z must be in position 2. How do we know this? If Z is the 2nd person to confess, there must be someone who confessed before Z! Who could that be? Only Y. Therefore, Y must have been the first person to confess and answer choice E must be false.