All intelligent people are nearsighted. I am very : GMAT Critical Reasoning (CR)
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# All intelligent people are nearsighted. I am very

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All intelligent people are nearsighted. I am very [#permalink]

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18 Nov 2009, 10:24
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All intelligent people are nearsighted. I am very nearsighted. So I must be a genius.

Which one of the following exhibits both of the logical flaws exhibited in the argument above?
(A) I must be stupid because all intelligent people are nearsighted and I have perfect eyesight.
(B) All chickens have beaks. This bird has a beak. So this bird must be a chicken.
(C) All pigs have four legs, but this spider has eight legs. So this spider must be twice as big as any pig.
(D) John is extremely happy, so he must be extremely tall because all tall people are happy.
(E) All geniuses are very nearsighted. I must be very nearsighted since I am a genius.
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18 Nov 2009, 11:43
IMHO (D)

John is extremely happy, so he must be extremely tall because all tall people are happy.

After some rephrasing lets compare it to question stem:

All tall peoples are happy.-----------------John is extremely happy.-----So he must be extremely tall.
All intelligent people are nearsighted.--- I am very nearsighted.-------So I must be a genius.

Their logical structures are same and logical fallacies (there are 2) are also the same
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18 Nov 2009, 23:09
Agree with D. Exactly the same structure. However I identified only one flaw in argument - intelligent vs. genius. Where is the second one?
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18 Nov 2009, 23:35
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bsv180985 wrote:
Agree with D. Exactly the same structure. However I identified only one flaw in argument - intelligent vs. genius. Where is the second one?

Flaw #1. All intelligent people are nearsighted. This doesn't mean that all nearsighted people are intelligent.

Flaw #2. Even if we assume that all nearsighted people are intelligent, this doesn't mean that if you are more nearsighted you would be more intelligent (=genious)
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19 Nov 2009, 01:43
shalva wrote:
bsv180985 wrote:
Agree with D. Exactly the same structure. However I identified only one flaw in argument - intelligent vs. genius. Where is the second one?

Flaw #1. All intelligent people are nearsighted. This doesn't mean that all nearsighted people are intelligent.

Flaw #2. Even if we assume that all nearsighted people are intelligent, this doesn't mean that if you are more nearsighted you would be more intelligent (=genious)

Clear now. Thanks. +1 for ya
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19 Nov 2009, 06:34
bsv180985 wrote:
shalva wrote:
bsv180985 wrote:
Agree with D. Exactly the same structure. However I identified only one flaw in argument - intelligent vs. genius. Where is the second one?

Flaw #1. All intelligent people are nearsighted. This doesn't mean that all nearsighted people are intelligent.

Flaw #2. Even if we assume that all nearsighted people are intelligent, this doesn't mean that if you are more nearsighted you would be more intelligent (=genious)

Clear now. Thanks. +1 for ya

good one!
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19 Nov 2009, 12:58
I think it should be B.

The original argument has the structure is

All A are B. I'm B therefore I'm A. B also follows this structure.
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19 Nov 2009, 19:24
The middle term is not distributed, hence any conclusion will be invalid. Also, an extraneous term such as "genius" should not be conflated with "intelligent people." Unfortunately, the second overextension is insidious and comparably harder to catch.
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19 Nov 2009, 19:31
IMO as well the answer shud be B not D .
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20 Nov 2009, 00:22
Original argument has 2 flaws, (B) has only 1 of them
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20 Nov 2009, 01:48
I loved that CR
+1

Quote:
All intelligent people are nearsighted. I am very nearsighted. So I must be a genius.

Two flaws here:
1) A--> B does not mean B--> A (the logical conclusion in backwards)
2) "very B" --> does not lead to "very A" (intensity)

I was between E and D

Slightly leaned towards E because it is in the same context. But I realized that E does not have the second flaw.
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20 Nov 2009, 04:46
Hi fellow GMATTers
Thanks for the responses

The OA given is D.......
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22 Nov 2009, 18:12
I went with C , reasoning that 4 : 8 relates to the normal to VERY. C has quantified the comparison and hence wrong.

So, it's D.

Re: Interesting CR   [#permalink] 22 Nov 2009, 18:12
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