Q9

[apom22]

9- Could be a complete and accurate list of the researchers who learn both A and Y Except?

this one has me really scratching my head.

[bbirdwell]

The question is "which one of these choices is a list of the EVERYONE that could do both A and Y together in a given scenario?" There are 4 choices in which the answer is "yes," and one where it is "no."

Consider this:

A bar serves 2 beers on Wednesday. There are four beers to choose from: Bud, Miller, Corona, Dos Equis.

1. Each of the following could be a complete and accurate list of the beers served on Wednesday EXCEPT:
A) Bud, Corona
B) Dos Equis, Miller
C) Bud, Corona, Miller

That's a different question than this one:

2.Which of the following is a complete and accurate list of the beers that could be served on Wednesday?
A) Bud, Corona, Miller
B) Corona, Miller, Dos Equis
C) Bud, Miller, Corona, Dos Equis

The correct answer to each is (C). The thing to watch out for is the placement of the "could be." The first example is like asking "which one of these could be a workable arrangement? (except)"

The second one is like asking "which one of these lists all the possibilities?"

[mcrittell]

Can you example this problem using the scenario provided? I think your example is distracting my understanding. Thanks!

[farhadshekib]

Can you example this problem using the scenario provided? I think your example is distracting my understanding. Thanks!

Let's look at the wrong answer choices.

(A) Scenario 1: Historian learns S+Y

Geologist learns S;
Historian learns S +Y;
Linguist learns Y +T and possibly R;
Paleontologist learns Y + T and possibly R (depending on L).

So, this shows that the historian can be the only researcher who learns both S + Y. Thus (A) is wrong.

(C) Scenario 2: Historian and Linguist learn S + Y

Geologist learns T;
Historian learns T +Y+ S;
Linguist learns S + Y + (possibly R);
Paleontologist learns Y + (possibly R - depends on L).

In this case, it is possible for both the historian and the linguist to learn both S + Y. Thus (C) is wrong.

(D) Scenario 3: Historian and Paleontologist learn S + Y

Geologist learns T;
Historian learns T +Y+ S;
Linguist learns Y + (possibly R);
Paleontologist learns Y + S (possibly R - depends on L).

In this case, it is possible for both the Historian and the Paleontologist to learn S + Y. Thus (D) is wrong.

(E) Scenario 4: Linguist and Paleontologist learn S + Y

Geologist learns T;
Historian learns T +Y + (possibly R);
Linguist learns Y + S (possibly R);
Paleontologist learns Y + S (possibly R - depends on H and L).

In this case, it is possible for both the Linguist and the Paleontologist to learn S + Y. Thus (E) is wrong.

--------------------------------------------------------------
The correct answer, then, is B.

The Paleontologist cannot be the only person who learns both
S+Y.

Why? Because 2 people must learn S, and 3 people must learn Y.

Moreover, we know that the historian, linguist and paleontologist must learn Y.

Therefore, the only other person who learns S in this situation can be the Geologist.

This, however, does not work, because if the Geologist learns S, the Historian must also learn S (Rule 6). Therefore, (B) is the correct answer. That is, the Paleontologist can never be the only person who learns both S + Y.

Hope this helps.

[ibrahim.elshamy]

I think the answer sheet on PrepTest #28 mismarks that question as 'C', so its good to see that 'B' is indeed the correct answer for #9.

Edit: And #8 before it is marked as B (but I think its properly 'C', yes?) -- so perhaps the two are just switched on the answer sheet.

[GeneW]

Can you example this problem using the scenario provided? I think your example is distracting my understanding. Thanks!

Let's look at the wrong answer choices.

(A) Scenario 1: Historian learns S+Y

Geologist learns S;
Historian learns S +Y;
Linguist learns Y +T and possibly R;
Paleontologist learns Y + T and possibly R (depending on L).

So, this shows that the historian can be the only researcher who learns both S + Y. Thus (A) is wrong.


Can someone clarify this. I still don't quite follow why B is the answer.

If the paleontologist can work in D and E with the historian and linguist respectively, why can't be the answer?

For example

(C) Scenario 2: Historian and Linguist learn S + Y

Geologist learns T;
Historian learns T +Y+ S;
Linguist learns S + Y + (possibly R);
Paleontologist learns Y + (possibly R - depends on L).

In this case, it is possible for both the historian and the linguist to learn both S + Y. Thus (C) is wrong.

(D) Scenario 3: Historian and Paleontologist learn S + Y

Geologist learns T;
Historian learns T +Y+ S;
Linguist learns Y + (possibly R);
Paleontologist learns Y + S (possibly R - depends on L).

In this case, it is possible for both the Historian and the Paleontologist to learn S + Y. Thus (D) is wrong.

(E) Scenario 4: Linguist and Paleontologist learn S + Y

Geologist learns T;
Historian learns T +Y + (possibly R);
Linguist learns Y + S (possibly R);
Paleontologist learns Y + S (possibly R - depends on H and L).

In this case, it is possible for both the Linguist and the Paleontologist to learn S + Y. Thus (E) is wrong.

--------------------------------------------------------------
The correct answer, then, is B.

The Paleontologist cannot be the only person who learns both
S+Y.

Why? Because 2 people must learn S, and 3 people must learn Y.

Moreover, we know that the historian, linguist and paleontologist must learn Y.

Therefore, the only other person who learns S in this situation can be the Geologist.

This, however, does not work, because if the Geologist learns S, the Historian must also learn S (Rule 6). Therefore, (B) is the correct answer. That is, the Paleontologist can never be the only person who learns both S + Y.

Hope this helps.

Can someone clarify this. I still don't quite follow why B is the answer.

If the paleontologist in D and E works, why does it not work in B? We can have as follows:

Geologist learns T;
Historian learns T + Y (possibly S depending on L);
Linguist learns Y (possibly S depending on H) and possibly R;
Paleontologist learns Y + S

In the case of A, the historian also has to have another researcher either G, L, or P who also learns Swahili due to rule 2. So if the historian works, why can't the paleontologist work?

It will be greatly appreciated if someone can clarify this. Thank you in advance.

[ohthatpatrick]

The problem with (B) is that JUST listing P as the only person who learns both S and Y would not be a complete and accurate list of the researchers who learn S and Y.

As you said in your scenario, either L or H will be the other person in Swahili. Since we know that L and H are both in Yoruba, whether we go with
PL in Swahili
or
PH in Swahili
in both cases, the COMPLETE list of people in both Swahili and Yoruba would be "paleontologist, historian" or "paleontologist, linguist".

In order for (B) to be correct, whoever is with P in Swahili CANNOT also be in Yoruba.

Let me know if you're still confused with this one.

[GeneW]

Thank you. I got it. In the case of A, it's the wrong answer b/c even though the geologist also learns S but not Y. So it's only the historian who is learning both. Is that right?

[tommywallach]

Hey Gene,

Farhad's post above explains it. : )

-t