I am stuck on this question. I was able to eliminate A,C,E but for some reason I am coming up with both B and D for answers which CANNOT be true.
Can someone explain how to get the right answer, please?
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- cbravo2963
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Vinny Gambini
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Atticus Finch
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Re: Q7
Thanks for posting, cbravo2963!
So, since this is a conditional question, the very first thing we should do is input the conditional information into a new sketch of our diagram:
Next, we should look at how this impacts the rules we've already sketched out, and see if we can follow the inference chain. Since L's second aisle is last, we don't need to worry about the O--L rule. And since the first K is clearly aisle 2, we can cut our relative ordering cluster down to something a little simpler:
Now, we have a chain of 4 elements, MKM--O, and only 6 spaces. There's only so many places that can really go! Making it worse, MKM is a chunk. The only way to fit that whole chunk in AND leave room for O after it would be if it were 3-4-5, 4-5-6, or 5-6-7.
If MKM were 3-4-5, then O would HAVE to go in 7. Anywhere else O went would require J and J to be consecutive!
If MKM were 4-5-6, similarly, O would HAVE to go in 8. Anywhere else O went would require J and J to be consecutive!
Now that we come to it, if MKM were 5-6-7, that would force O to be 8, and then J and J would be consecutive! Okay, so that won't work. Looks like we only have the two options above.
From the first scenario, we can see that K could indeed stock only even numbered aisles (2 and 4)! So (D) is a could be true.
In fact, all four of the wrong answers are seen in one of these two scenarios:
Only (B) must be false. O isn't on aisle 6 in either of those scenarios. If we tried to force it, that would require MKM to be in 3-4-5. That leaves only aisles 7 and 8 for the remaining two Js, and that would mean they are consecutive!
The biggest culprit of incorrect answers on conditional questions is failure to fully play out the inference chain!
Please let me know if that completely answers your question!
So, since this is a conditional question, the very first thing we should do is input the conditional information into a new sketch of our diagram:
Next, we should look at how this impacts the rules we've already sketched out, and see if we can follow the inference chain. Since L's second aisle is last, we don't need to worry about the O--L rule. And since the first K is clearly aisle 2, we can cut our relative ordering cluster down to something a little simpler:
Now, we have a chain of 4 elements, MKM--O, and only 6 spaces. There's only so many places that can really go! Making it worse, MKM is a chunk. The only way to fit that whole chunk in AND leave room for O after it would be if it were 3-4-5, 4-5-6, or 5-6-7.
If MKM were 3-4-5, then O would HAVE to go in 7. Anywhere else O went would require J and J to be consecutive!
If MKM were 4-5-6, similarly, O would HAVE to go in 8. Anywhere else O went would require J and J to be consecutive!
Now that we come to it, if MKM were 5-6-7, that would force O to be 8, and then J and J would be consecutive! Okay, so that won't work. Looks like we only have the two options above.
From the first scenario, we can see that K could indeed stock only even numbered aisles (2 and 4)! So (D) is a could be true.
In fact, all four of the wrong answers are seen in one of these two scenarios:
- (A) J is on aisle 3 in Scenario 2!
(C) J-O-J happens in Scenario 1!
(D) K is on even aisles in Scenario 1!
(E) O-L happens in Scenario 2!
Only (B) must be false. O isn't on aisle 6 in either of those scenarios. If we tried to force it, that would require MKM to be in 3-4-5. That leaves only aisles 7 and 8 for the remaining two Js, and that would mean they are consecutive!
The biggest culprit of incorrect answers on conditional questions is failure to fully play out the inference chain!
Please let me know if that completely answers your question!
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