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All intelligent people are nearsighted

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All intelligent people are nearsighted [#permalink]

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New post 13 Feb 2017, 06:08
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Difficulty:

  95% (hard)

Question Stats:

40% (01:30) correct 60% (01:08) wrong based on 162 sessions

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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.
[Reveal] Spoiler: OA

Last edited by broall on 09 Jun 2017, 02:20, edited 1 time in total.
Reformatted question

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Re: All intelligent people are nearsighted [#permalink]

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New post 13 Feb 2017, 08:12
Nahid078 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.


In my opinion , it is B ...why D is preferred over B...

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Re: All intelligent people are nearsighted [#permalink]

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New post 13 Feb 2017, 21:46
Top Contributor
sobby wrote:
Nahid078 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.


In my opinion , it is B ...why D is preferred over B...


You have to read the argument carefully.

let us break it down.
Premise 1: intelligent --> nearsighted.
Premise 2: very nearsighted
Conclusion: genius (very intelligent).

let us look at option D -
Premise 1: tall people --> happy.
Premise 2: extremely happy
Conclusion: extremely tall.

Note the modifiers "very" and "extremely".

B does not add these modifiers in premise 2 and the conclusion. hence, incorrect.
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Re: All intelligent people are nearsighted [#permalink]

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New post 15 Feb 2017, 07:09
sobby wrote:
Nahid078 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.


In my opinion , it is B ...why D is preferred over B...


The above post clarifies your query. In case you have further queries, please click again on the "request expert reply" button, mentioning your query - closing this request.

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Re: All intelligent people are nearsighted [#permalink]

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New post 24 Jul 2017, 03:15
Option B is talking about something, which is NOUN, whereas option D is talking about quality, which is adjective. The prompt also talks about adjective.
So, it is D.
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Re: All intelligent people are nearsighted [#permalink]

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New post 24 Jul 2017, 04:00
A causes B , so if B then A

Flaw: B has the only one cause

not any option fits the prephrased flaw ideally, only D assumes the same flaw

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All intelligent people are nearsighted [#permalink]

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New post 12 Nov 2017, 04:32
I missed the word "very" before near sighted and ended up choosing B. Classic trap set for reading in hurry.

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All intelligent people are nearsighted   [#permalink] 12 Nov 2017, 04:32
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