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

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Intern
Joined: 10 Sep 2015
Posts: 20
Location: United States
Two farmers, who never left their farms their whole lives, were lookin  [#permalink]

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20 Aug 2016, 08:50
1
7
00:00

Difficulty:

65% (hard)

Question Stats:

64% (02:07) correct 36% (02:12) wrong based on 287 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!!!
Senior Manager
Joined: 23 Apr 2015
Posts: 300
Location: United States
WE: Engineering (Consulting)
Re: Two farmers, who never left their farms their whole lives, were lookin  [#permalink]

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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!!!

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 ?

+1 for kudos
Director
Joined: 26 Aug 2016
Posts: 619
Location: India
GMAT 1: 690 Q50 V33
GMAT 2: 700 Q50 V33
GMAT 3: 730 Q51 V38
GPA: 4
WE: Information Technology (Consulting)
Re: Two farmers, who never left their farms their whole lives, were lookin  [#permalink]

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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.
Intern
Joined: 19 Dec 2016
Posts: 43
Location: Malaysia
GMAT 1: 630 Q49 V27
GMAT 2: 640 Q43 V34
GPA: 4
Re: Two farmers, who never left their farms their whole lives, were lookin  [#permalink]

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

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Retired Moderator
Status: The best is yet to come.....
Joined: 10 Mar 2013
Posts: 495
Re: Two farmers, who never left their farms their whole lives, were lookin  [#permalink]

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