Q5

[PinsyuanW243]

I have no idea about how to tackle with this question. I have two hypotheticals.

Q/U U/Q R S P T W
Q/U S R U/Q P T W

all I know is PTW always occupied the last 3
and the ans shows "at some time." Does it means "some times are" and "some times are not"

I can cross out (A) according to my hypothethicals
Other ans seems all must be true to me
Please kindly assist.

[ohthatpatrick]

First we'd get the PTW chunk on our page and then ask ourselves, "do any other rules connect"?

Since Q - W,
we have Q - PTW

Since U - P
we have

U
....\
......PTW
..../
Q

Since R or T is 3, and there is no way for T to still be 3, we know that R is 3.
__ __ R __ __ __ __

And since S is connected to R, S is either 2 or 4.

Your two scenarios looked good!

(A) is W always before R? No it never is. Eliminate.

(B) is U always before R?
No, it could be Q S R U P T W. Eliminate.

(C) is S always before U?
No, it could be Q U R S P T W. Eliminate.

(D) Is R always before P?
Yes. We know that R is 3 and P is 5.

(E) Is Q always before S?
No, it could be U S R Q P T W


It looks like you just lost track of your task: MUST BE TRUE.
You seemed to be thinking multiple answers were right because B through E all could be true, but that would be asking ourself the wrong question.

On Must Be True, we're asking ourselves "Is this always true? Or could it be false? Can I think of a counterexample that would let me eliminate this answer?"

Hope this helps.