Q21

[bailey.danielle98]

Hi can anyone explain why answer choice E is correct - why isn't B or D correct?

I see that O can review Sunset if I draw out that scenario, but L reviewing T also seems fine.....

[giladedelman]

Thanks for the question!

Question 21 introduces a new condition: exactly three of the students review U. As with any conditional question, we want to make all the inferences we can before jumping to the answer choices.

So, which three students could review U? K only reviews T, so our only possibilities are J, L, M, and O. Now, if J reviewed U, that would mean neither L nor M could, so we'd only have two students reviewing that play -- which violates the new condition! So it must be that L, M, and O review U.

Now let's look at the answer choices. Remember, we can expect four answers that must be false and one that could be true.

(E) is correct. O must review U and T, but it still has room to review S.

(A) is incorrect; we just said M reviews U.
(B) is incorrect; N reviews U.
(C) is incorrect; we said that J can't review U.
(D) is incorrect; if L reviews U, it doesn't have room to review anything else.

Does that answer your question? Remember, on conditional questions, it's really all about following the inference chain.

[bailey.danielle98]

Thanks for the response - this was helpful!

I realize I missed a key inference that M can only review 2 plays and therefore K and L must only review 1 play since they each review fewer of the plays than M.

I was initially thinking that K/O could review U.

[ManhattanPrepLSAT1]

bailey.danielle98 wrote:

Hi can anyone explain why answer choice E is correct on question 21 - why isn't B or D correct?

I see that O can review Sunset if I draw out that scenario, but L reviewing T also seems fine.....

[giladedelman]

Thanks for the question!

Question 21 introduces a new condition: exactly three of the students review U. As with any conditional question, we want to make all the inferences we can before jumping to the answer choices.

So, which three students could review U? K only reviews T, so our only possibilities are J, L, M, and O. Now, if J reviewed U, that would mean neither L nor M could, so we'd only have two students reviewing that play -- which violates the new condition! So it must be that L, M, and O review U.

Now let's look at the answer choices. Remember, we can expect four answers that must be false and one that could be true.

(E) is correct. O must review U and T, but it still has room to review S.

(A) is incorrect; we just said M reviews U.
(B) is incorrect; N reviews U.
(C) is incorrect; we said that J can't review U.
(D) is incorrect; if L reviews U, it doesn't have room to review anything else.

Does that answer your question? Remember, on conditional questions, it's really all about following the inference chain.

[giladedelman]

Thanks for the response - this was helpful!

I realize I missed a key inference that M can only review 2 plays and therefore K and L must only review 1 play since they each review fewer of the plays than M.

I was initially thinking that K/O could review U.

[naderboy2002]

I'm still somewhat confused on this question because how do we satisfy the last rule that "Exactly two of the students review exactly the same play or plays as each other?" In this case J reviews only S, K reviews only T, L reviews only U, M reviews U and T, and O reviews T U and S. Which two of the students would review the same play in this scenario?

[giladedelman]

M could review U and S, which would allow J and K to both review only T.

You dig?

[canutos]

M could review U and S, which would allow J and K to both review only T.

You dig?

I see. The important words here are at the end of the last stipulation: "Exactly two of the students review exactly the same PLAY or PLAYS."