lsat june 1996 - section 1, question 5

[cornofstarchy]

Hi, I need some help with this one. Here's the question:

ADMIN EDIT: QUESTION DELETED. PLEASE DO NOT POST LSAC LSAT QUESTIONS.

I've tried it and I keep getting A, B, C, D are true but E is false. The answer key says that D is the correct answer. Can anyone explain to me why? Or is the question worded incorrectly? Should it say, "Which one of the following must be FALSE?" Cause that would make E true...

Oh yea, here are my "solutions"...

A)
G,H,J,Q,R,F
H,G,J,Q,R,F

B)
G,H,J,Q,R,F
J,G,H,Q,R,F

C)
H,G,J,Q,R,F
G,J,H,Q,R,F

D)
G,H,J,Q,R,F
G,J,H,Q,R,F

E)
Can't because it must end as Q,R,F to fulfill the restriction that R comes immediately before F. Q must always be on day 4.

[cornofstarchy]

Nevermind, I figured it out and here's the answer in case anyone needs it:

Solution:
The correct answer is D. To get the answer, simply negate the selection. We know that Q,R,F must be on days 4,5,6 respectively. Choice D says that either H or J is scheduled for day 3. So, if neither J or H is scheduled for day 3, then it should fail.

ex) J,H,G,Q,R,F

This fails because if G is scheduled for day 3, then Q must be scheduled for day 5. As you can see, Q is not scheduled for day 5. Therefore, D is the correct answer because we cannot put J or H on a day that's not day 3.

[rakovsky]

SETUP:
6 days, 1 factory per day, F, G, H, J, Q, R

F= 1 or 6
J...Q
QRF
G=3 --> Q=5 therefore Q=/=5 --> G=/=3

Choice A.
J G H Q R F works so A might not be true.

Choice B.
H G J Q R F works so B might not be true.

Choice C.
G H J Q R F works so C might not be true.

Choice D.

QRF must be last, and G can't be third. So either H or J must be scheduled for day 3.

Answer= Choice D

I find that I spend significant amounts of time on the choices leading up to the right answer. In the case above, the right answer was easy for me to see. Is there a way that I can usually look ahead and spot the right answer quickly, or is it a waste of time because it is not so easy?

[cornofstarchy]

Sorry. The more you do, the faster you'll get. That's all there really is to it, I'm afraid.

[krusta80]

What's the average time alotted per question on the LSAT?

[larbgai]

cornofstarchy-
While your answer is right, I don't think your logic is correct.

You said that "Therefore, D is the correct answer because we cannot put J or H on a day that's not day 3."

That isn't true. We can't put G on day 3, so day 3 must be J or H.


We can determine that the sequence is XXXQRF.

Then, we recognize that since Q is not in position 5, G cannot be in position 3. So J/H must be in position 3. This is why the answer is D........

But if we put J on day 3, we can put H on day 1 or 2, and vice versa.