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Two farmers, who never left their farms their whole lives, were lookin

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Two farmers, who never left their farms their whole lives, were lookin [#permalink]

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Question Stats:

65% (01:32) correct 35% (01:47) wrong based on 228 sessions

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Two farmers, who never left their farms their whole lives, were looking at their dogs and observed that all their border collies were black and white. The border collies were the only things that the farmers ever saw as a mix of black and white. Farmer Gil luckily but correctly observed that if something is a border collie then it must be black and white. Farmer Geva then remarked that if something is not black and white, then it is not a border collie.

The argument is flawed primarily because Farmer Geva:
A. fails to realize that there are other dog breeds apart from border collies
B. fails to realize that being black and white is a necessary but insufficient condition to be called a border collie
C. lacks sufficient information on which to base the condition for being a border collie
D. only observes one type of phenomenon – border collies and their color
E. demonstrates only limited knowledge about the world outside

GMAT experts. Can you please let me know flaw in Farmer Geva claim. As per my understanding if A is B then Not B is Not A holds true. Please let me know what is correct reasoning. And how should we attack such a question.

Thanks!!!
[Reveal] Spoiler: OA

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Re: Two farmers, who never left their farms their whole lives, were lookin [#permalink]

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New post 20 Aug 2016, 12:47
FollowurDream wrote:
Two farmers, who never left their farms their whole lives, were looking at their dogs and observed that all their border collies were black and white. The border collies were the only things that the farmers ever saw as a mix of black and white. Farmer Gil luckily but correctly observed that if something is a border collie then it must be black and white. Farmer Geva then remarked that if something is not black and white, then it is not a border collie.

The argument is flawed primarily because Farmer Geva:
A. fails to realize that there are other dog breeds apart from border collies
B. fails to realize that being black and white is a necessary but insufficient condition to be called a border collie
C. lacks sufficient information on which to base the condition for being a border collie
D. only observes one type of phenomenon – border collies and their color
E. demonstrates only limited knowledge about the world outside

GMAT experts. Can you please let me know flaw in Farmer Geva claim. As per my understanding if A is B then Not B is Not A holds true. Please let me know what is correct reasoning. And how should we attack such a question.

Thanks!!!


Answer is B
It's a mistaken negation. "Farmer Geva then remarked that if something is not black and white, then it is not a border collie.". For one thing, Farmer Geva uses "something", it should be narrowed down to dogs, as Farmer Gill did. Let there a table which is black and white, that what can we infer from Farmer Geva's statement ?


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Re: Two farmers, who never left their farms their whole lives, were lookin [#permalink]

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New post 20 Apr 2017, 12:03
Worst question i have seen till now. All options are wrong only D makes little sense but it is also wrong.
Contra positive is RIGHT in GMAT.
clearly both the guys mean same thing.
If a then b, other says , if not b, then not a. :/
I don't like this question at all.

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Re: Two farmers, who never left their farms their whole lives, were lookin [#permalink]

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New post 20 Apr 2017, 22:25
B for me.. As it being black and white is nit sufficient condition


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Re: Two farmers, who never left their farms their whole lives, were lookin [#permalink]

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New post 01 Aug 2017, 01:00
Seems to be debatable question.

As per my understanding, if A is a necessary condition of B, that means A must happen for B to happen. In other words, if B happened, A must be true. If A is not true, then B can't happen.

In summary: If B then A. If non A then non B.

So, I think Geva's remark is not flawed.
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Hasan Mahmud

Kudos [?]: 142 [0], given: 172

Re: Two farmers, who never left their farms their whole lives, were lookin   [#permalink] 01 Aug 2017, 01:00
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