Every photograph, because it involves the light rays that : GMAT Critical Reasoning (CR)
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# Every photograph, because it involves the light rays that

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VP
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Every photograph, because it involves the light rays that [#permalink]

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05 Sep 2004, 04:59
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Every photograph, because it involves the light rays that something emits hitting film, must in some obvious sense be true. But because it could always have been made to show things differently than it does, it cannot express the whole truth and, in that sense, is false.
Therefore, nothing can ever be definitively proved with a photograph.

Which one of the following, if true, would cast doubt on the experimentersâ€™ conclusion?

A. Whatever is false in the sense that it cannot express the whole truth cannot furnish definitive proof.

B. The whole truth cannot be known.

C. It is not possible to determine the truthfulness of a photograph in any sense.

D. It is possible to use a photograph as corroborative evidence if there is additional evidence establishing the truth about the scene photographed.

E. If something is being photographed, then it is possible to prove definitively the truth about it.
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05 Sep 2004, 07:07
I would pick E because in D, if there is no additional evidence, it leaves open the possibility that a photograph, as a stand alone piece of evidence, cannot prove anything
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Paul

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05 Sep 2004, 08:56
another vote for "D"

To weaken the conclusion: "Therefore, nothing can ever be definitively proved with a photograph"

choice "D" clearly says the case in which this "ever" of conclusion can be wrong that is "It is possible to use a photograph as corroborative evidence if there is additional evidence establishing the truth about the scene photographed"

Whats the OA ?

Dharmin
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05 Sep 2004, 09:48
My choice is answer B.
Conclusion: Nothing can be proved definitely with the photograph.
Supports: It cannot express the whole truth because it can always be made to show things differently than it does

A. Supports the conclusion
B. Weakens the conslusion as if the whole truth cannot be known, then the above stated premise is not false.
C. Supports
D. Supports, in essence it says that photograph cannot be the only proof, it can only suppliment other evidences
E. Actually find this a little irrelevant, as the premises and conclusion is about photographs and what is about to be photograph.

What's the OA?
Director
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05 Sep 2004, 10:54
Paul wrote:
I would pick E because in D, if there is no additional evidence, it leaves open the possibility that a photograph, as a stand alone piece of evidence, cannot prove anything

Another vote for E. In addition to Paul's explanation, note the opposing word usage in conclusion (nothing can be...) and E (something can be...)
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05 Sep 2004, 17:52
E is my choice.

E. If something is being photographed, then it is possible to prove
definitively the truth about it.
Here, it goes in the opposite stream of the conclusion. It says
1) if somehitng is being photographed
2) then is possible to prove definitively the truth about whatever is being pictured

While the conclusion is
1) if something is being photographed
2) cannot be used to prove anything definitively
VP
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06 Sep 2004, 08:04
Unfortunately, no one has not gotten the right answer so far.

The OA is (A)

why?

thank you.
Director
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06 Sep 2004, 08:48
had the question asked for inference, "A" would have been right. But to weaken the argument we need to consider "E" not "A". "A" reiterates what is already known about the argument. the conclusion says that nothing can be proved with a photograph, but if we show that there is some truth in what is being photographed, then conclusion will fall apart.

E should be it... anyway, what's the official explanation for "A"?
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06 Sep 2004, 09:08
Indeed, I disagree with A. As dj said, A is an inference. This must be one of those vague LSAT questions
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Paul

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06 Sep 2004, 11:11
I would pick E too.
It is an choice between E and D, but I think E is more valid and concerned about the topic.

I also disagree that A is the correct answer.
I know LSAT questions are slightly different from GMAT but the questions on LSAT have helped me to learn more concerning critical reasoning.

This question, if it is LSAT or GMAT, obviously would not help me.

A cant be correct if we have to find an reason to doubt the conlusion.

Regards,

Alex
[#permalink] 06 Sep 2004, 11:11
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# Every photograph, because it involves the light rays that

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