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QOTD # 10 X-ray examination of a recently discovered painti

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QOTD # 10 X-ray examination of a recently discovered painti [#permalink] New post 22 Sep 2016, 01:31
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37% (02:00) correct 62% (02:18) wrong based on 197 sessions
X-ray examination of a recently discovered painting—judged by some authorities to be a self-portrait by Vincent van Gogh—revealed an underimage of a woman’s face. Either van Gogh or another painter covered the first painting with the portrait now seen on the surface of the canvas. Because the face of the woman in the underimage also appears on canvases van Gogh is known to have painted, the surface painting must be an authentic self-portrait by van Gogh.

The conclusion is properly drawn if which of the following is assumed?

A) If a canvas already bears a painted image produced by an artist, a second artist who uses the canvas to produce a new painting tends to be influenced by the style of the first artist.
B) Many painted canvases that can be reliably attributed to van Gogh contain underimages of subjects that appear on at least one other canvas that van Gogh is known to have painted.
C) Any painted canvas incorrectly attributed to van Gogh would not contain an underimage of a subject that appears in authentic paintings by that artist.
D) A painted canvas cannot be reliably attributed to an artist unless the authenticity of any underimage that painting might contain can be reliably attributed to the artist.
E) A painted canvas cannot be reliably attributed to a particular artist unless a reliable x-ray examination of the painting is performed

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Question: 10
Page: 77
[Reveal] Spoiler: OA

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Re: QOTD # 10X-ray examination of a recently discovered painting [#permalink] New post 22 Sep 2016, 01:32
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Explanation

The passage’s argument makes a case for the painting’s being an authentic van Gogh self-portrait; it cites as evidence the fact that the canvas’s painted-over image is that of a woman who appears in other van Gogh paintings. This argument assumes that another artist would not have painted over the original image of the woman, so the correct answer is Choice C. Since the argument does not depend upon the painting’s stylistic elements or upon the commonalities between this and other van Gogh paintings, Choices A and B are incorrect. Choices D and E establish criteria for attribution beyond the passage’s argument, so they are incorrect as well.
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Re: QOTD # 10 X-ray examination of a recently discovered painti [#permalink] New post 03 Mar 2018, 02:23
i got this right..but i took 3:30 min is it OK ?
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Re: QOTD # 10 X-ray examination of a recently discovered painti [#permalink] New post 03 Mar 2018, 03:51
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Too much.

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Re: QOTD # 10 X-ray examination of a recently discovered painti [#permalink] New post 13 May 2018, 19:40
Why not option B ?
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Re: QOTD # 10 X-ray examination of a recently discovered painti [#permalink] New post 15 May 2018, 15:41
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Because we care about of the authenticity to find our assumption. B talks about the appearance in his paintings.

Hope this helps.

Ask for further assistance if you do need.

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Re: QOTD # 10 X-ray examination of a recently discovered painti [#permalink] New post 01 Jul 2018, 00:38
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Yiddo_Bhushan wrote:
Why not option B ?

option (B) is a close call : It states many, not all paintings -> what if one one painting has been found without the under-image; this may invalidate the option.
so (B) is not correct.
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Re: QOTD # 10 X-ray examination of a recently discovered painti [#permalink] New post 05 Jul 2019, 20:19
Please explain why not D?
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Re: QOTD # 10 X-ray examination of a recently discovered painti [#permalink] New post 08 Jul 2019, 15:49
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D) A painted canvas cannot be reliably attributed to an artist unless the authenticity of any underimage that painting might contain can be reliably attributed to the artist.

The assumption is that even though another type of painting which is not made by Van Gogh would NOT contain an underlying image

D instead talks about any generally painted canvas which authenticity can not be attributed to another artist.

All that means: out of scope. We care about Van Gogh and the underlined image in his works.

Ask for further assistance.

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Re: QOTD # 10 X-ray examination of a recently discovered painti [#permalink] New post 06 May 2020, 22:03
Yeah, this argument passage is certainly on the harder side. It reminds me of exactly why I'm taking the GRE instead of the LSAT for law school. Fifty percent of the LSAT is made up of EXACTLY these kinds of questions (logical reasoning), and these questions are the sole reason why I'm taking the GRE rather than the LSAT. I take wayyy too long reading these things and trying to wrap my head around them that I would certainly run out of time on the LSAT. Thankfully, the GRE only has 1 or 2 of these types of questions in each Verbal section, and I always save them for very last.
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Re: QOTD # 10X-ray examination of a recently discovered painting [#permalink] New post 28 Oct 2020, 07:52
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Carcass wrote:
Explanation

The passage’s argument makes a case for the painting’s being an authentic van Gogh self-portrait; it cites as evidence the fact that the canvas’s painted-over image is that of a woman who appears in other van Gogh paintings. This argument assumes that another artist would not have painted over the original image of the woman, so the correct answer is Choice C. Since the argument does not depend upon the painting’s stylistic elements or upon the commonalities between this and other van Gogh paintings, Choices A and B are incorrect. Choices D and E establish criteria for attribution beyond the passage’s argument, so they are incorrect as well.

I’m going to employ the methods from David Kiloran’s PowerScore Logical Reasoning Bible.

First you need to understand that the category belongs to the Justify the Conclusion group.

That said you need to break down the relevant premises and the conclusion.

Premise 1: Either van Gogh or another painter covered the first painting

In logical notation we denote “van Gogh painted the painting” as V and another “painter painted the painting” as P.

Thus the logical notation for Premise 1 is:

P —> V
V —> P


These are logical equivalent since they are contrapositives.

Conclusion: Because the face of the woman in the underimage also appears on canvases van Gogh is known to have painted, the surface painting must be an authentic self-portrait by van Gogh

Let “Woman in the under image also appears on canvases van Gogh is known to have painted” as W and “the surface painting must be an authentic self-portrait by van Gogh” is equivalent to “van Gogh painted the painting” so it is also V

Thus the logical notation for Conclusion is:

W —> V

So in summary we have:

P1: P —> V; V —> P
C: W—> V

We need another premise P2 that allows us to go from P1 to C.

The only premise that allows us to do this is W—>P because W—>P + P —> V = W—>P —> V = W —> V which is the conclusion C.

The only answer that has P2 is Answer choice C which is the logical contrapositive of P2:

“Any painted canvas incorrectly attributed to van Gogh would not contain an underimage of a subject that appears in authentic paintings by that artists”

This is essentially saying P—>W which equals W—>P.

Although it may seem complicated based on what I wrote. If you understand the method and now how to break down the problem into logical steps you can breeze through this problem in about 30 seconds. I highly recommend that PowerScore book. It requires a learning curve to learn the logic, but the payoff is immense in terms of learning to dealing with any CR problem efficiently and easily.
Re: QOTD # 10X-ray examination of a recently discovered painting   [#permalink] 28 Oct 2020, 07:52
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