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Scientists have discovered a new species of butterfly that

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Scientists have discovered a new species of butterfly that [#permalink]

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Scientists have discovered a new species of butterfly that lives only in a small region of Central America and is active only at night. During the day, it rests in treetops, where its green color matches the foliage perfectly. Therefore, the scientists must have discovered the butterfly at night.

The argument depends on which of the following assumptions?

A) The newly discovered butterfly is not related to any other species of butterfly.
B) There is no way for the scientists to detect the butterfly during the day.
C) No other butterfly species lives in this region of Central America.
D) The foliage in the butterfly's habitat is completely green.
E) The butterfly cannot survive in areas outside of Central America.
[Reveal] Spoiler: OA

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i konw its B or D, but i cant figure out which one of these two is wrong.

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New post 31 Oct 2007, 11:47
I think the answer is D.

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New post 31 Oct 2007, 15:46
rajkumargnv wrote:
I think the answer is D.


I say D too....

what's the OA?

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New post 31 Oct 2007, 17:11
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Im going to go with B. If I assume that scientists cannot discover the butterfly on daytime, then it must have been discovered at night.

If that wasn't enough, Option D clearly paraphrases a premise in the passage (it rests in treetops, where its green color matches the foliage perfectly), thus, it can't be an assumption.

What's the OA?

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New post 31 Oct 2007, 20:21
i dont konw the OA yet, but i will as soon as i finish this exam and get the results. ill post it then.

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New post 31 Oct 2007, 20:49
Hard to decide b/w B and D. But I am going with D my reasons are as follows:
1) Assumptions must be true that is we should be abel to defend the assumption with the statements, either implicitly or explicitly.

2) If B is the answer there was no reason to bring up a new premise which is butterfly turns to green and the foliage is green.

So when making this premise the author assumed that all the foliage is green and this has to be true for the conclusion to be true.

But B is kind of a conclusion and does not look like an unstated premise to me. I could be wrong. Lets wait for the OA.

Soomodh

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Re: CR: Butterfly [#permalink]

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New post 01 Nov 2007, 07:30
jimjohn wrote:
Scientists have discovered a new species of butterfly that lives only in a small region of Central America and is active only at night. During the day, it rests in treetops, where its green color matches the foliage perfectly. Therefore, the scientists must have discovered the butterfly at night.

The argument depends on which of the following assumptions?

A) The newly discovered butterfly is not related to any other species of butterfly.
B) There is no way for the scientists to detect the butterfly during the day.
C) No other butterfly species lives in this region of Central America.
D) The foliage in the butterfly's habitat is completely green.
E) The butterfly cannot survive in areas outside of Central America.


I'll go with B because if butterfly's green color matches the foliage perfectly there are still possibilities (ways, instrucments) to detect its existence during the daytime. There are so many specifies we are not able to see naked eyes but we have instruments to find them out. This is only B that states that there was no other way for scientists to detect the butterfly during the day that concludes the scientists must have discovered the butterfly at night.

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Re: CR: Butterfly [#permalink]

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New post 01 Nov 2007, 08:18
jimjohn wrote:
Scientists have discovered a new species of butterfly that lives only in a small region of Central America and is active only at night. During the day, it rests in treetops, where its green color matches the foliage perfectly. Therefore, the scientists must have discovered the butterfly at night.

The argument depends on which of the following assumptions?

A) The newly discovered butterfly is not related to any other species of butterfly.
B) There is no way for the scientists to detect the butterfly during the day.
C) No other butterfly species lives in this region of Central America.
D) The foliage in the butterfly's habitat is completely green.
E) The butterfly cannot survive in areas outside of Central America.


Reasonably sure it's B.

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Re: CR: Butterfly [#permalink]

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New post 01 Nov 2007, 08:56
jimjohn wrote:
Scientists have discovered a new species of butterfly that lives only in a small region of Central America and is active only at night. During the day, it rests in treetops, where its green color matches the foliage perfectly. Therefore, the scientists must have discovered the butterfly at night.

The argument depends on which of the following assumptions?

A) The newly discovered butterfly is not related to any other species of butterfly.
B) There is no way for the scientists to detect the butterfly during the day.
C) No other butterfly species lives in this region of Central America.
D) The foliage in the butterfly's habitat is completely green.
E) The butterfly cannot survive in areas outside of Central America.


I'd go for B. This is one where thinking about the negation of answer choices can be helpful. Suppose D is false, and some of the foliage is not green. The passage's argument could still hold up: the butterfly just camouflages itself in the green parts of the foliage.

But if B is false, and there is a way for scientists to detect the butterfly during the day, then the argument doesn't make sense. It may be hard to see the butterfly, but if scientists have another method, then we can't conclude that they discovered the butterfly at night.

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Re: CR: Butterfly [#permalink]

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New post 01 Nov 2007, 19:38
johnrb wrote:
jimjohn wrote:
Scientists have discovered a new species of butterfly that lives only in a small region of Central America and is active only at night. During the day, it rests in treetops, where its green color matches the foliage perfectly. Therefore, the scientists must have discovered the butterfly at night.

The argument depends on which of the following assumptions?

A) The newly discovered butterfly is not related to any other species of butterfly.
B) There is no way for the scientists to detect the butterfly during the day.
C) No other butterfly species lives in this region of Central America.
D) The foliage in the butterfly's habitat is completely green.
E) The butterfly cannot survive in areas outside of Central America.


I'd go for B. This is one where thinking about the negation of answer choices can be helpful. Suppose D is false, and some of the foliage is not green. The passage's argument could still hold up: the butterfly just camouflages itself in the green parts of the foliage.

But if B is false, and there is a way for scientists to detect the butterfly during the day, then the argument doesn't make sense. It may be hard to see the butterfly, but if scientists have another method, then we can't conclude that they discovered the butterfly at night.


Exactly what I did. Good advice!

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Re: CR: Butterfly [#permalink]

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GMATBLACKBELT wrote:
johnrb wrote:
jimjohn wrote:
Scientists have discovered a new species of butterfly that lives only in a small region of Central America and is active only at night. During the day, it rests in treetops, where its green color matches the foliage perfectly. Therefore, the scientists must have discovered the butterfly at night.

The argument depends on which of the following assumptions?

A) The newly discovered butterfly is not related to any other species of butterfly.
B) There is no way for the scientists to detect the butterfly during the day.
C) No other butterfly species lives in this region of Central America.
D) The foliage in the butterfly's habitat is completely green.
E) The butterfly cannot survive in areas outside of Central America.


I'd go for B. This is one where thinking about the negation of answer choices can be helpful. Suppose D is false, and some of the foliage is not green. The passage's argument could still hold up: the butterfly just camouflages itself in the green parts of the foliage.

But if B is false, and there is a way for scientists to detect the butterfly during the day, then the argument doesn't make sense. It may be hard to see the butterfly, but if scientists have another method, then we can't conclude that they discovered the butterfly at night.


Exactly what I did. Good advice!



That's actually a good trick. It seems like a good way to attack problems like these which ask for assumptions.

Assuming Option is FALSE, does the argument still make sense?

Thanks!

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New post 03 Nov 2007, 11:12
the OA was B

(B) CORRECT. In order for this argument to work, one has to assume that there is no way for the scientists to detect the butterfly during the day, despite its camouflage. If there is a way for the scientists to detect the butterfly during the day, the conclusion is no longer logical.

(D) Whether the foliage is completely green or partially green is irrelevant as to when it was discovered

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New post 04 Nov 2007, 16:56
Good one guys, I agree.

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Scientists have discovered a new species of butterfly that [#permalink]

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Scientists have discovered a new species of butterfly that lives only in a small region of Central America and is
active only at night. During the day, it rests in treetops, where its green color matches the foliage perfectly.
Therefore, the scientists must have discovered the butterfly at night.

The argument depends on which of the following assumptions?

• The newly discovered butterfly is not related to any other species of butterfly.
• There is no way for the scientists to detect the butterfly during the day.
• No other butterfly species lives in this region of Central America.
• The foliage in the butterfly’s habitat is completely green.
• The butterfly cannot survive in areas outside of Central America.

Last edited by mandald on 16 Apr 2012, 23:18, edited 1 time in total.

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Re: Assumtion Question [#permalink]

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New post 16 Apr 2012, 10:02
I'd say B.

The assumption acts as a logical bridge between the premise and the conclusion. The conclusion is about the scientists not being able to detect them. So the correct answer must include some information about scientists in order to be true.

A) unnecessary information
B) If the butterfly hides during the day and the scientists are only able to find them at night, they must be unable to find them during the day
C) not important
D) not important
E) probably the reason why it only lives in that area, but not important for conclusion to be true.

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Re: Assumtion Question [#permalink]

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New post 16 Apr 2012, 10:31
BN1989 wrote:
I'd say B.

The assumption acts as a logical bridge between the premise and the conclusion. The conclusion is about the scientists not being able to detect them. So the correct answer must include some information about scientists in order to be true.

A) unnecessary information
B) If the butterfly hides during the day and the scientists are only able to find them at night, they must be unable to find them during the day
C) not important
D) not important
E) probably the reason why it only lives in that area, but not important for conclusion to be true.


Hi,

Could you please xplain why D is "Not Important"..

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Re: Assumtion Question [#permalink]

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New post 16 Apr 2012, 10:59
mandald wrote:
BN1989 wrote:
I'd say B.

The assumption acts as a logical bridge between the premise and the conclusion. The conclusion is about the scientists not being able to detect them. So the correct answer must include some information about scientists in order to be true.

A) unnecessary information
B) If the butterfly hides during the day and the scientists are only able to find them at night, they must be unable to find them during the day
C) not important
D) not important
E) probably the reason why it only lives in that area, but not important for conclusion to be true.


Hi,

Could you please xplain why D is "Not Important"..

Even if it might not be completely green, it would still match the foliage perfectly, so that the scientists would still be unable to find them there.

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Re: Assumtion Question [#permalink]

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New post 22 May 2012, 06:28
Confused with B and D :
Try negating the assumption....
• There is no way for the scientists to detect the butterfly during the day.
There is some way for scientists to detect butterfly during the day . Therefore the scientists must have discovered the butterfly at night...

By negating the assumption the conclusion becomes untrue . Therefore B is correct...
• The foliage in the butterfly’s habitat is completely green.
Try negating the above sentence :
The foliage in the butterfly's habitat is not completely green.Therefore the scientists must have discovered the butterfly at night.......

The conclusion can still be true .... So D is incorrect...

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Re: Assumtion Question [#permalink]

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New post 22 May 2012, 07:38
mandald wrote:
Could you please xplain why D is "Not Important"..


During the day, it rests in treetops, where its green color matches the foliage perfectly.

D The foliage in the butterfly’s habitat is completely green.

I found answer D to be irrelevant because it is already stated that the butterfly matches the foliage perfectly. It doesn't matter what color the foliage is. It could be hot pink and it is established that it matches perfectly.

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Re: Assumtion Question   [#permalink] 22 May 2012, 07:38

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