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Director
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All intelligent people are nearsighted. I am very [#permalink]
 09 May 2005, 16:59
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22. 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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Manager
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Answer is D
Intelligent= near sight ASSUMPTION very near sight = very intelligent, genius
Tall = happy Very Tall = Very happy
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GMAT Club Legend
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All I -> N
Very N -> Very I (Genius)
The flaw here is to give you a general relationship, and then reverse
the relationship illogically under an extreme circumstance.
Here, the general relationship is Intelligent -> Nearsighted (All I->N)
The author then reverse the relationship illogically (N->I, when it should be Not N -> Not I)
The extreme circumstance given is Genius (very intelligent) because he is Very nearsighted.
So now look at the answer choices:
(A) All I->N, S->P. Different logic.
(B) All C->B. B->C. Different logic.
(C) All P->4L. S->8L. S->2*P. Different logic.
(D) All T->H. John: Extemely happy -> Extremely tall. Same logic as passage.
(E) All G->V.N. I: V.N->G. Different logic
D for me.
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Manager
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Ans B.
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GMAT Club Legend
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shalinikhatri wrote: Ans B.
B only commits 1 of the 2 flaws in the original passage. There is no extreme condition given in choice (B).
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Director
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Will choose B
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Manager
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D
Wilfred is right. We would need to have bigger beak for the bird and a "super" chicken, so to speak, to make B correct.
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Senior Manager
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D too
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Director
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(D)
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Manager
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One for B
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Regards,
Wunderbar03
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Intern
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Dudes it has to be (D) 
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Manager
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Those who chose B pls explain why
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B)...
argument: all A are B ! i am B ! so i am A !
B) all A are B ! it is B ! so it is A ! => same reasoning
D) all A are B ! he is C ! so he is D ! => not the same reasoning, because we cannot deduce that happy = extremely happy and tall = extremely tall.
_________________
If your mind can conceive it and your heart can believe it, have faith that you can achieve it.
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Manager
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Yes !! The ans should be D
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Christoph, it shud be "D"....argument is actually twisted it actually says
all A are B ! I am C (extreme B) ! so I must be D (extreme A)! ......"D" has the same logic. I missed this nuance in the first go as well.
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banerjeea_98 wrote: Christoph, it shud be "D"....argument is actually twisted it actually says
all A are B ! I am C (extreme B) ! so I must be D (extreme A)! ......"D" has the same logic. I missed this nuance in the first go as well.
baner, you are right. thx 
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If your mind can conceive it and your heart can believe it, have faith that you can achieve it.
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Senior Manager
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I guess time for OA?
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Director
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The OA is D.
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Current Student
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Late, but D.
D can be rewritten as:
All happy people are tall. John is extremely happy, so he must be extremely tall.
which is very similiar to...
All intelligent people are nearsighted. I am very nearsighted. So I must be a genius.
Eureka!
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