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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08 Sep 2007, 19:19
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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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Re: CR: All intelligent people are nearsighted. I am very ne [#permalink]

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09 Sep 2007, 08:48
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Fistail wrote:
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.

This one must be LSAT. I just learn this concept recently, so I'll try to give my detailed explanation....

Anyways, the logic here is that:
Stem: intelligent -> nearsighted
Conclusion: nearsighted -> intelligent

This conclusion is flawed because the reversed is not true. The only thing we can conclude from here is that: not nearsighted -> not intelligent

A: intelligent -> nearsighted, not nearsighted -> not intelligent
This is actually a valid conclusion and it is not flawed. Therefore, it is not the right answer. INCORRECT

B. Chicken -> have beaks, have beaks -> chicken
This sounds about the same as the stem.

C. pig -> 4 legs, 8 legs -> twice as big as pigs
No correlation what so ever, INCORRECT

D. Tall -> happy, happy -> tall
This also sounds the same as the stem

E. Genius-> very nearsighted, Genius -> very nearsighted
This is not the same as the stem either...INCORRECT

So we are down to B or D
Since they are similar logic, we need to look at the stem closely. Once you do, you see that genius is an extreme form of intelligent. So the revised stem should be

intelligent -> nearsighted
extremely nearsighted -> extremely intelligent

Now, compare B and D again
For B,
Chicken -> have beaks
have beaks -> chicken

For D,
Tall -> happy,
Extremely happy -> Extremely tall

D must be the correct answer.
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Re: CR: All intelligent people are nearsighted. I am very ne [#permalink]

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08 Sep 2007, 21:05
Fistail wrote:
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.

I think its E..
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Re: CR: All intelligent people are nearsighted. I am very ne [#permalink]

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08 Sep 2007, 21:33
My vote is for D

First let's identify the 2 flaws
1. Y implies X. Hence X imples Y (Intelligent implies nearsighted; hence nearsighted implies intelligent)
2. extrapolating intelligent to genius (very nearsighted to very intelligent)

A- wrong : Intelligent=>nearsighted; hence not(nearsighted)=>not(intelligent)
B seems closes but has only the first flaw: Chicken => Beak. Hence Beak => chicken
C-wrong : direct since ratios are brought in
D-CORRECT : tall=>happy; so very happy => very tall
E - Genius => very nearsighted - has none of the flaws

What's OA ?
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Re: All intelligent people are nearsighted. I am very [#permalink]

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05 Jun 2013, 23:34
Made it wrong. missed the overstatement error.
posting OE for others:

This argument commits two errors. First, it takes a necessary condition to be sufficient. The
statement "All intelligent people are nearsighted" means that for a person to be intelligent he or she must
necessarily be nearsighted. But being nearsighted is not sufficient to make one intelligent. Second, the
argument overstates the claim made in the premise. The premise is about intelligent people in general, not
a subgroup of intelligent people—geniuses. Now in choice (D), the statement "all tall people are happy"
has the same form as "All intelligent people are nearsighted"; the statement "John is extremely happy" has
the same form as "I am very nearsighted"; and the statement "so he must be extremely tall” has the same
form as "So I must be a genius.” This shows a one-to-one correspondence between choice (D) and the
given argument. Hence the answer is (D).
Choices (A) and (E) are eye-catchers because they mention nearsightedness. Remember the answer to
a logical structure (logical flaw) argument will have the same structure as the given argument but will be in
a different context.
(B) is second-best. It does commit the fallacy of taking a necessary condition to be sufficient, but it
does not overstate the claim.
It's hard to give choice (C) any meaning.
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Re: All intelligent people are nearsighted. I am very [#permalink]

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07 Jun 2013, 22:55
Wow, another LSAT question. Tricky question. KEY is "both of the logical flaws". We need two show TWO FLAWS in the argument.
* First flaw: All intelligent people are nearsighted
* Second flaw: I'm very nearsighted. So I must be a genius

The correct answer MUST have TWO FLAWS in its reasoning.

(A) I must be stupid because all intelligent people are nearsighted and I have perfect eyesight.
Wrong. Not the pattern mentioned in the question. Nearsighted >< perfect eyesight.

(B) All chickens have beaks. This bird has a beak. So this bird must be a chicken.
Wrong. SHELL GAME. The wording is quite similar to the question, but it's a trap. Because B has only ONE flaw in its reasoning.
* First part: All chicken have beaks ==> Correct, it does not have flaw.
* Second part: This bird has a beak. So this bird must be a chicken ==> Wrong.
B is wrong because it has ONLY ONE FLAW.

(C) All pigs have four legs, but this spider has eight legs. So this spider must be twice as big as any pig.
Wrong. Out of scope.

(D) John is extremely happy, so he must be extremely tall because all tall people are happy.
Correct.
* First flaw: All tall people are happy ==> Wrong. It's so ridiculous
* Second flaw: John is extremely happy, so he must be extremely tall ==> Wrong
D has TWO FLAWS in its reasoning ==> must be the answer.

(E) All geniuses are very nearsighted. I must be very nearsighted since I am a genius.

Hope it helps.
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Re: All intelligent people are nearsighted. I am very [#permalink]

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08 Jun 2013, 20:48
I wonder whether this kind of questions are asked on GMAT!
Re: All intelligent people are nearsighted. I am very   [#permalink] 08 Jun 2013, 20:48
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