Which one of the following, if substituted for the constraint that the house in Riverton must be shown either first o...

Sangwook on September 29, 2015

Help

Could you please explain why the rest of the answer choices were wrong? Especially, (C) seems very attractive to me. Yes, I was trapped by (C). Thanks,

2 Replies

Melody on October 2, 2015

Regarding answer choice (C): Just because V must be shown either third or fourth does not mean that R is going to be first or second, which is what we need to replace rule number one. In this sense, we could have V 4th and R 5th, showing us that (C) doesn't give us the same effect on the order.

Regarding answer choice (D): We can use our previous work from question 9 here. As you can see, it is possible in this scenario (using our old rules) for 1: S, 2: R, 3: V, 4:Q, 5: T. But, if we replace answer choice (D) with rule number 1, we can no longer have this be a viable scenario since R and Q must be next to one another.

Regarding answer choice (E): So if T is not shown fifth, then it is shown first. So if (E) is followed, when T is not 5th, we would have 1:T, then 2: R (since T must immediately be shown before R, according to the rule in (E)). But, what about when T is fifth? What do we know about R? Nothing. So, we could technically follow (E) and rules 2-4 and have: 1:S, 2:V, 3:Q, 4:R, 5:T. So, in this scenario we are not breaking any rules having R 4th, but this does not give us the same effect on the order as before.

Thus, answer choice C, D, and E are wrong.

Hope that helps! Please let us know if you have any other questions.

Sangwook on October 5, 2015

Thanks a lot!!!^^