If Country X does not intervene militarily in Country Y, : GMAT Critical Reasoning (CR)
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# If Country X does not intervene militarily in Country Y,

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If Country X does not intervene militarily in Country Y, [#permalink]

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23 Feb 2007, 02:56
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If Country X does not intervene militarily in Country Y, then the whole region will definitely fall under enemy influence.

It most logically follows from the statement above that, if Country X does intervene militarily in Country Y, then the whole region
(A) Will definitely fall under enemy influence
(B) Will probably fall under enemy influence
(C) Will probably not fall under enemy influence
(D) Will definitely not fall under enemy influence
(E) May or may not fall under enemy influence
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23 Feb 2007, 05:18
C...
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23 Feb 2007, 05:48
C or E..............I'm confused!
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23 Feb 2007, 06:02
E is not affirmative enough, especially with the word "may"
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23 Feb 2007, 07:28
E.

We only know that if the do NOT intervene, then Y will fall to the enemy.

If they DO intervene, then Y may or may not fall to the enemy.
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23 Feb 2007, 14:05
I am with E too, we can't really conclude anything from the statement except that it has a chance of not falling, but it also has a chance of falling
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23 Feb 2007, 14:10
I go with E as well. Mostly because it is possible that country X only has three soldiers...which gives them only a slightly better chance, and will then make sure that country X also falls under enemy rule...No info about country X...maybe country X is the invader
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23 Feb 2007, 17:11
I'd go with D.
Question is "most logically follows from the statement". Statement says that, if X doesn't intervene Y then all region will definitely fall.... Yes, it might, it might not, might probably, but the statemant says will definitely. So most logically, in my opinion, we should turn everythig around, i.e. if X intervenes Y, that all region will definitely not fall... Yes, it might, it might not, might probably, we don't know, but we are asked to follow the logic flow of the statement which suggests D.
What's the OA?
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23 Feb 2007, 17:39
linau wrote:
I'd go with D.
Question is "most logically follows from the statement". Statement says that, if X doesn't intervene Y then all region will definitely fall.... Yes, it might, it might not, might probably, but the statemant says will definitely. So most logically, in my opinion, we should turn everythig around, i.e. if X intervenes Y, that all region will definitely not fall... Yes, it might, it might not, might probably, we don't know, but we are asked to follow the logic flow of the statement which suggests D.
What's the OA?

This actually doesn't work. You cannot conclude the negative of a conditional logically follows from the conditional. If A, then B does not mean if not A, then not B. The only thing you can logically conclude is the contrapositive - if not B, then not A. In this case, I think that would be something like "If the whole region is definitely not going to fall under enemy influence, then Country X will have to intervene." Doesn't help us find an answer though, since it asks for if not A, then what?

I'd say the answer is E.
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23 Feb 2007, 20:37
klong009 wrote:
linau wrote:
I'd go with D.
Question is "most logically follows from the statement". Statement says that, if X doesn't intervene Y then all region will definitely fall.... Yes, it might, it might not, might probably, but the statemant says will definitely. So most logically, in my opinion, we should turn everythig around, i.e. if X intervenes Y, that all region will definitely not fall... Yes, it might, it might not, might probably, we don't know, but we are asked to follow the logic flow of the statement which suggests D.
What's the OA?

This actually doesn't work. You cannot conclude the negative of a conditional logically follows from the conditional. If A, then B does not mean if not A, then not B. The only thing you can logically conclude is the contrapositive - if not B, then not A. In this case, I think that would be something like "If the whole region is definitely not going to fall under enemy influence, then Country X will have to intervene." Doesn't help us find an answer though, since it asks for if not A, then what?

I'd say the answer is E.

How is E different from C?
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23 Feb 2007, 20:53
aurobindo wrote:
klong009 wrote:
linau wrote:
I'd go with D.
Question is "most logically follows from the statement". Statement says that, if X doesn't intervene Y then all region will definitely fall.... Yes, it might, it might not, might probably, but the statemant says will definitely. So most logically, in my opinion, we should turn everythig around, i.e. if X intervenes Y, that all region will definitely not fall... Yes, it might, it might not, might probably, we don't know, but we are asked to follow the logic flow of the statement which suggests D.
What's the OA?

This actually doesn't work. You cannot conclude the negative of a conditional logically follows from the conditional. If A, then B does not mean if not A, then not B. The only thing you can logically conclude is the contrapositive - if not B, then not A. In this case, I think that would be something like "If the whole region is definitely not going to fall under enemy influence, then Country X will have to intervene." Doesn't help us find an answer though, since it asks for if not A, then what?

I'd say the answer is E.

How is E different from C?

C - Will probably not fall under enemy influence

E - May or may not fall under enemy influence

C suggests that it is more likely that the region won't fall under enemy influence. We don't know that, and we can't assume it. We have no information about "probably."

E doesn't imply that one outcome (falling or not falling) is more likely than the other. That's all we can know - if County X intervenes, the region may or may not fall. We can't logically conclude any of the other answers.

Does that help?
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23 Feb 2007, 20:55
klong009 wrote:
aurobindo wrote:
klong009 wrote:
linau wrote:
I'd go with D.
Question is "most logically follows from the statement". Statement says that, if X doesn't intervene Y then all region will definitely fall.... Yes, it might, it might not, might probably, but the statemant says will definitely. So most logically, in my opinion, we should turn everythig around, i.e. if X intervenes Y, that all region will definitely not fall... Yes, it might, it might not, might probably, we don't know, but we are asked to follow the logic flow of the statement which suggests D.
What's the OA?

This actually doesn't work. You cannot conclude the negative of a conditional logically follows from the conditional. If A, then B does not mean if not A, then not B. The only thing you can logically conclude is the contrapositive - if not B, then not A. In this case, I think that would be something like "If the whole region is definitely not going to fall under enemy influence, then Country X will have to intervene." Doesn't help us find an answer though, since it asks for if not A, then what?

I'd say the answer is E.

How is E different from C?

C - Will probably not fall under enemy influence

E - May or may not fall under enemy influence

C suggests that it is more likely that the region won't fall under enemy influence. We don't know that, and we can't assume it. We have no information about "probably."

E doesn't imply that one outcome (falling or not falling) is more likely than the other. That's all we can know - if County X intervenes, the region may or may not fall. We can't logically conclude any of the other answers.

Does that help?

Thanks Klong.

OA is E.
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24 Feb 2007, 12:00
Ya im not surprised its E. We can infer anything about the probibility of it falling, and therefore it must be something neutral, like "may or may not"
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25 Feb 2007, 09:37
'E' is broader statement than 'C'. Therefore greater chances to be true.
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25 Feb 2007, 10:08
If A = always doing something
then non A = not doing something sometimes

If A = never doing something
then non A = doing something sometimes

If A = doing something sometimes
then non A = never doing something

If A = not doing something sometimes
then non A = always doing something

Courtesy HongHu's post from the stickies....

E it is
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26 Feb 2007, 01:43
trivikram wrote:
If A = always doing something
then non A = not doing something sometimes

If A = never doing something
then non A = doing something sometimes

If A = doing something sometimes
then non A = never doing something

If A = not doing something sometimes
then non A = always doing something

Courtesy HongHu's post from the stickies....

E it is

Vikky, can you please elaborate on how you applied this logic in the above question?
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Re: CR: Enemy influence [#permalink]

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26 Feb 2007, 04:39
aurobindo wrote:
If Country X does not intervene militarily in Country Y, then the whole region will definitely fall under enemy influence.

It most logically follows from the statement above that, if Country X does intervene militarily in Country Y, then the whole region
(A) Will definitely fall under enemy influence
(B) Will probably fall under enemy influence
(C) Will probably not fall under enemy influence
(D) Will definitely not fall under enemy influence
(E) May or may not fall under enemy influence

If Country X does not intervene militarily in Country Y, then the whole region will definitely fall under enemy influence

This is of the the type

Y if and only if X
This is the equivalent of: If X then Y, AND if Y then X. Also, if non X then non Y. If non Y then non X

So we are now asked if non X then non Y

But here Y is the whole region will definitely fall under enemy influence

so non Y is apply the rule from my previous post.

If A = always doing something
then non A = not doing something sometimes

So non Y is not falling definetely under enemy influence some times..

E is the closest representation.
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Re: CR: Enemy influence [#permalink]

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26 Feb 2007, 05:22
trivikram wrote:
aurobindo wrote:
If Country X does not intervene militarily in Country Y, then the whole region will definitely fall under enemy influence.

It most logically follows from the statement above that, if Country X does intervene militarily in Country Y, then the whole region
(A) Will definitely fall under enemy influence
(B) Will probably fall under enemy influence
(C) Will probably not fall under enemy influence
(D) Will definitely not fall under enemy influence
(E) May or may not fall under enemy influence

If Country X does not intervene militarily in Country Y, then the whole region will definitely fall under enemy influence

This is of the the type

Y if and only if X
This is the equivalent of: If X then Y, AND if Y then X. Also, if non X then non Y. If non Y then non X

So we are now asked if non X then non Y

But here Y is the whole region will definitely fall under enemy influence

so non Y is apply the rule from my previous post.

If A = always doing something
then non A = not doing something sometimes

So non Y is not falling definetely under enemy influence some times..

E is the closest representation.

Or is it of "Y unless X" structure ?

Definitely fall under enemy influence unless military intervention

"Y unless X" structure means Non X then Y, and Non Y then X

X = Definitely fall under enemy influence
Y = Military intervention

If we go by Non X then Y, structure:

Non X = some times not falling under enemy influence

Hence the option E is the answer.

Is my understanding right?
Re: CR: Enemy influence   [#permalink] 26 Feb 2007, 05:22
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# If Country X does not intervene militarily in Country Y,

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