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aurobindomahanty
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Rifka: We do not need to stop and ask for directions. We would not nee 24 May 2017, 23:44
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B
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95% (hard)

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36% (01:32) correct 64% (01:40) wrong based on 704 sessions

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Rifka: We do not need to stop and ask for directions. We would not need to do that unless, of course, we were lost.

Craig: The fact that we are lost is precisely why we need to stop.

In the exchange above, the function of Craig’s comment is to

(A) contradict the conclusion of Rifka’s argument without offering any reason to reject any of Rifka’s implicit premises
(B) deny one of Rifka’s implicit premises and thereby arrive at a different conclusion
(C) imply that Rifka’s argument is invalid by accepting the truth of its premises while rejecting its conclusion
(D) provide a counterexample to Rifka’s generalization
(E) affirm the truth of the stated premise of Rifka’s argument while remaining noncommittal about its conclusion
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B
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Rifka: We do not need to stop and ask for directions. We would not nee Updated on: 25 May 2017, 00:38
Originally posted by deep14 on 25 May 2017, 00:29.
Last edited by deep14 on 25 May 2017, 00:38, edited 1 time in total.
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B. Rifkas argument structure-> Conclusion. Premise.
Now this premise contains two sub premises 1. They aren't lost 2. If they are lost they need help.
Rifka decides to stick to Premise 1 and hence the conclusion
But Craig thinks that they are lost. Therefore he doesn't agree with premise 1 and hence arrives at totally opposite conclusion

Sent from my SM-E700H using GMAT Club Forum mobile app
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Rifka: We do not need to stop and ask for directions. We would not nee 25 May 2017, 00:30
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aurobindomahanty
Rifka: We do not need to stop and ask for directions. We would not need to do that unless, of course, we were lost.
Craig: The fact that we are lost is precisely why we need to stop.
In the exchange above, the function of Craig’s comment is to

(A) contradict the conclusion of Rifka’s argument without offering any reason to reject any of Rifka’s implicit premises
(B) deny one of Rifka’s implicit premises and thereby arrive at a different conclusion
(C) imply that Rifka’s argument is invalid by accepting the truth of its premises while rejecting its conclusion
(D) provide a counterexample to Rifka’s generalization
(E) affirm the truth of the stated premise of Rifka’s argument while remaining noncommittal about its conclusion
Show more


Rifka: We do not need to stop and ask for directions. We would not need to do that unless, of course, we were lost.
Craig: The fact that we are lost is precisely why we need to stop.
In the exchange above, the function of Craig’s comment is to


Rifka: If lost ,then stop and ask
Craig:If lost ,then stop

(A) contradict the conclusion of Rifka’s argument without offering any reason to reject any of Rifka’s implicit premises
(B) deny one of Rifka’s implicit premises and thereby arrive at a different conclusion
(C) imply that Rifka’s argument is invalid by accepting the truth of its premises while rejecting its conclusion
(D) provide a counterexample to Rifka’s generalization
(E) affirm the truth of the stated premise of Rifka’s argument while remaining noncommittal about its conclusion
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Rifka: We do not need to stop and ask for directions. We would not nee 25 May 2017, 19:10
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Hey Experts,

Didn't quiet understand the question and the answer. Please explain.
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Ravindra.here
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Rifka: We do not need to stop and ask for directions. We would not nee 21 Nov 2017, 09:34
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aurobindomahanty
Rifka: We do not need to stop and ask for directions. We would not need to do that unless, of course, we were lost.
Craig: The fact that we are lost is precisely why we need to stop.
In the exchange above, the function of Craig’s comment is to

(A) contradict the conclusion of Rifka’s argument without offering any reason to reject any of Rifka’s implicit premises
(B) deny one of Rifka’s implicit premises and thereby arrive at a different conclusion
(C) imply that Rifka’s argument is invalid by accepting the truth of its premises while rejecting its conclusion
(D) provide a counterexample to Rifka’s generalization
(E) affirm the truth of the stated premise of Rifka’s argument while remaining noncommittal about its conclusion
Show more

A nice question on conditional Reasoning
I got it wrong in my attempt.
UNLESS INTRODUCES A NECESSARY CONDITION
therefore, If i write the rifika's conclusionWe would not need to do that unless, of course, we were lost in sufficient condition and necessary condition form it will be ((( I will choose if , then indicators to be more precise))

IF we need to stop and ask for directions, then we are lost-------1

A contrapositive (( correct reversal )) of this statement will be
IF we are not lost , then we do not need to stop and ask for directions------2

Coming to Craig's Conclusion The fact that we are lost is precisely why we need to stop.

Compare this to 1 and 2 we find no similarities

Infact this is the wrong negation of the statement 2
Option b says that deny one of Rifka’s implicit premises and thereby arrive at a different conclusion
Craig is coming to a different conclusion by using mistaken reversal of statement 2. Also he is acting against the premise of rifika we do not need to stop and ask for directions .
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Rifka: We do not need to stop and ask for directions. We would not nee 21 Nov 2017, 09:42
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AbdurRakib
aurobindomahanty
Rifka: We do not need to stop and ask for directions. We would not need to do that unless, of course, we were lost.
Craig: The fact that we are lost is precisely why we need to stop.
In the exchange above, the function of Craig’s comment is to

(A) contradict the conclusion of Rifka’s argument without offering any reason to reject any of Rifka’s implicit premises
(B) deny one of Rifka’s implicit premises and thereby arrive at a different conclusion
(C) imply that Rifka’s argument is invalid by accepting the truth of its premises while rejecting its conclusion
(D) provide a counterexample to Rifka’s generalization
(E) affirm the truth of the stated premise of Rifka’s argument while remaining noncommittal about its conclusion


Rifka: We do not need to stop and ask for directions. We would not need to do that unless, of course, we were lost.
Craig: The fact that we are lost is precisely why we need to stop.
In the exchange above, the function of Craig’s comment is to


Rifka: If lost ,then stop and ask
Craig:If lost ,then stop

(A) contradict the conclusion of Rifka’s argument without offering any reason to reject any of Rifka’s implicit premises
(B) deny one of Rifka’s implicit premises and thereby arrive at a different conclusion
(C) imply that Rifka’s argument is invalid by accepting the truth of its premises while rejecting its conclusion
(D) provide a counterexample to Rifka’s generalization
(E) affirm the truth of the stated premise of Rifka’s argument while remaining noncommittal about its conclusion
Show more

AbdurRakib
Hi AbdurRakib
Though you arrived at the right answer , the form of conditional reasoning you used is wrong
Unless introduces a necessary condition
IF introduces a sufficient condition , then introduces a necessary condition
To find a conditional indicator such as UNLESS we need to write the part before UNLESS BY removing not, as sufficient
condition and the part with UNLESS ,becomes the necessary condition

therefore, If i write the rifika's conclusion
We would not need to do that unless, of course, we were lost in sufficient condition and necessary condition form it will be ((( if , then indicators))

IF we need to stop and ask for directions, then we are lost-------1

A contrapositive (( correct reversal )) of this statement will be
IF we are not lost , then we do not need to stop and ask for directions------2

What you wrote as reasoning is mistaken reversal
Please correct me if i am wrong.
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Rifka: We do not need to stop and ask for directions. We would not nee 03 Dec 2017, 08:30
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Can anyone please explain the correct answer please? I still do not understand
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Rifka: We do not need to stop and ask for directions. We would not nee 16 Oct 2022, 01:15
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What an incredible question in a dire need of an expert explanation.

GMATNinja

Please step in :)

Posted from my mobile device
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Rifka: We do not need to stop and ask for directions. We would not nee 08 Apr 2024, 09:58
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can someone please tell the difference between option b and c?? why is option B better?
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Rifka: We do not need to stop and ask for directions. We would not nee 15 Apr 2024, 00:48
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DrAnkita91
can someone please tell the difference between option b and c?? why is option B better?
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­Hey @DrAnkita91

Let me try to help!

Rifka's argument:
Conclusion -> We do not need to stop and ask for directions.
Reasoning -> We would not need to stop and ask for directions unless we were actually lost.
Implicit premise -> We are not actually lost.
Understanding the Logical play -> If we were actually lost, then, yes, we would need to stop and ask for directions. But we are not actually lost (implicit). So, we do not need to stop and ask for directions (conclusion).

Craig's counter:
The fact that we are lost is precisely why we need to stop.

Rifka's implicitly considers that they are not lost. Craig denies the truth of this. He states as a fact that they are lost. Based on his outright denial of Rifka's implicit premise, Craig arrives at a different conclusion to Rifka's ("we need to stop" vs. "we do not need to stop").

Hope you see why choice B is correct.

The issue with choice C -> While Craig does reject Rifka's conclusion, he does not accept the truth of Rifka's premises. As we have seen, Craig denies the truth of Rifka's implicit premise. The issue with choice C is "by accepting the truth of its premises". Not true.

Hope this helps!
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Rifka: We do not need to stop and ask for directions. We would not nee 13 Sep 2025, 00:09
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