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All intelligent people are nearsighted. I am very [#permalink]
09 May 2005, 15:59
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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.
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.