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All of John's friends say they know someone who has smoked

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All of John's friends say they know someone who has smoked [#permalink] New post 17 Dec 2010, 06:07
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

56% (02:18) correct 44% (01:34) wrong based on 138 sessions
All of John's friends say they know someone who has smoked 40 cigarettes a day for the past 40 years and yet who is really fit and well. John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.

If the statements in the passage are true, then which one of the following must also be true?

(A) Smoking often lie about how much they smoke.
(B) People often knowingly exaggerate without intending to lie.
(C) All John's friends know the same lifelong heavy smoker.
(D) Most of John's friends are not telling the truth.
(E) Some of John's friends are not telling the truth.
[Reveal] Spoiler: OA

Last edited by Zarrolou on 04 Jun 2013, 23:22, edited 1 time in total.
Edited the question.
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Re: need help in CR to sort out doubt ?? [#permalink] New post 17 Dec 2010, 11:33
aimkp wrote:
All of John's friends say they know someone who has smoked 40 cigarettes a day for the past 40 years and yet who is really fit and well. John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.
If the statements in the passage are true, then which one of the following must also be true?
(A) Smoking often lie about how much they smoke.
(B) People often knowingly exaggerate without intending to lie.
(C) All John's friends know the same lifelong heavy smoker.
(D) Most of John's friends are not telling the truth.
(E) Some of John's friends are not telling the truth.


Hi!

Here we have an inference question - we're looking for a conclusion that MUST be true based on one or more of the statements in the stimulus.

Inference stimuli are not arguments (i.e. they don't contain evidence, a conclusion and rely on assumptions) - they're usually just a loose collection of facts. Accordingly, it's very difficult to predict the answer to an inference question. Instead, we evaluate each choice, asking if it MUST be true.

Paraphrasing the stimulus:

All John's friends make a claim; John can't make the same claim; it's certain that some of his friends can't as well.

To the choices:

A) Assuming the first word should be "smokers" - no info about what smokers say about their own habits - outside the scope, eliminate A.

B) People "often"... as soon as you see the word "often", we know that B is too extreme. We can't extrapolate about what often happens based on a small sample size. In general, beware of extreme answers on inference questions.

C) The stimulus actually tells us that some of John's friends are in the same position as John, i.e. they can't really make the claim. (C), therefore, must be false - eliminate.

D) We know that John isn't unique, but "most" is too extreme - eliminate (D).

E) Perfect! If John isn't unique among his friends in not being able to make the claim, but ALL of his friends have made it, then SOME of them must be lying - choose (E)!
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Re: need help in CR to sort out doubt ?? [#permalink] New post 26 Dec 2010, 15:05
To skovinsky,

My ans is D. Would you explain a little bit why can't it be D?

From my view, What if John is really unique, would the ans is D?
Moreover, the question state quite clear that all of his friends know sbd smoke hard but still healthy.
Since the question is extreme, our answer should extreme too.

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Re: need help in CR to sort out doubt ?? [#permalink] New post 26 Dec 2010, 17:38
Thanet wrote:
To skovinsky,

My ans is D. Would you explain a little bit why can't it be D?

From my view, What if John is really unique, would the ans is D?
Moreover, the question state quite clear that all of his friends know sbd smoke hard but still healthy.
Since the question is extreme, our answer should extreme too.

thanet


+1 E

Cannot be D because the argument mentions "...he is not unique among his friends in this respect". In this sense, probably there is only one of his friends who is providing wrong information. Thefore, you cannot say that MOST of his friends are not telling the truth.
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Re: need help in CR to sort out doubt ?? [#permalink] New post 26 Dec 2010, 20:50
Good explanation.

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Re: need help in CR to sort out doubt ?? [#permalink] New post 02 Jul 2011, 23:44
that was straight forward . all you need to do is to think in terms of a set or venn diagram
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Re: need help in CR to sort out doubt ?? [#permalink] New post 03 Jul 2011, 09:54
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aimkp wrote:
All of John's friends say they know someone who has smoked 40 cigarettes a day for the past 40 years and yet who is really fit and well. John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.
If the statements in the passage are true, then which one of the following must also be true?
(A) Smoking often lie about how much they smoke.
(B) People often knowingly exaggerate without intending to lie.
(C) All John's friends know the same lifelong heavy smoker.
(D) Most of John's friends are not telling the truth.
(E) Some of John's friends are not telling the truth.


This question is actually not testing our logical thinking so much as it is testing our comfort level in English.

John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.
<=>
John does not know anyone like that and it is also true that John is not the only one, who doesn't know any such person, among his friends.
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Re: need help in CR to sort out doubt ?? [#permalink] New post 03 Jul 2011, 19:43
e
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Re: need help in CR to sort out doubt ?? [#permalink] New post 04 Jul 2011, 10:06
fluke wrote:
aimkp wrote:
All of John's friends say they know someone who has smoked 40 cigarettes a day for the past 40 years and yet who is really fit and well. John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.
If the statements in the passage are true, then which one of the following must also be true?
(A) Smoking often lie about how much they smoke.
(B) People often knowingly exaggerate without intending to lie.
(C) All John's friends know the same lifelong heavy smoker.
(D) Most of John's friends are not telling the truth.
(E) Some of John's friends are not telling the truth.


This question is actually not testing our logical thinking so much as it is testing our comfort level in English.

John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.
<=>
John does not know anyone like that and it is also true that John is not the only one, who doesn't know any such person, among his friends.


Dear Fluke
you nailed it man
even i misses this importance of this 'Unique' word :( :( :(

Thanks god you literally printed my thoughts over here :wink: :wink:
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Re: need help in CR to sort out doubt ?? [#permalink] New post 02 Jun 2013, 23:54
metallicafan wrote:
Thanet wrote:
To skovinsky,

My ans is D. Would you explain a little bit why can't it be D?

From my view, What if John is really unique, would the ans is D?
Moreover, the question state quite clear that all of his friends know sbd smoke hard but still healthy.
Since the question is extreme, our answer should extreme too.

thanet


+1 E

Cannot be D because the argument mentions "...he is not unique among his friends in this respect". In this sense, probably there is only one of his friends who is providing wrong information. Thefore, you cannot say that MOST of his friends are not telling the truth.

But it is said "ALl of john's friends " --- why not most in this case ?? Please elaborate
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Re: need help in CR to sort out doubt ?? [#permalink] New post 03 Jun 2013, 00:11
ruplun wrote:
metallicafan wrote:
Thanet wrote:
To skovinsky,

My ans is D. Would you explain a little bit why can't it be D?

From my view, What if John is really unique, would the ans is D?
Moreover, the question state quite clear that all of his friends know sbd smoke hard but still healthy.
Since the question is extreme, our answer should extreme too.

thanet


+1 E

Cannot be D because the argument mentions "...he is not unique among his friends in this respect". In this sense, probably there is only one of his friends who is providing wrong information. Thefore, you cannot say that MOST of his friends are not telling the truth.

But it is said "ALl of john's friends " --- why not most in this case ?? Please elaborate


most means > 50%
some means - unspecified amount, but not zero.

From the premises, we cannot be sure that more than 50% of the John's friend are liars, but we can certainly say some are liars. These some can go from 1-99%. 100% would be ALL.
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Re: All of John's friends say they know someone who has smoked [#permalink] New post 04 Jun 2013, 02:18
I am not sure if the answer is "E".
My perspective is the passage says that

"All of John's friends say they know someone who has smoked 40 cigarette ... "
and question says

"If the statements in the passage are TRUE .... "

So I assumed that all of John's friends are speaking the truth. This is my perspective. Please correct me if I am wrong.

IMO, answer is B
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Re: All of John's friends say they know someone who has smoked [#permalink] New post 04 Jun 2013, 06:45
Hi - The key phrase in the question is

say they know someone

I.e. for the passage to be true (as it says) the people just have to have said that they know some one. They don't actually have to have been telling the truth.

So E is the correct answer.

Hope that helps

James
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Re: All of John's friends say they know someone who has smoked [#permalink] New post 04 Jun 2013, 23:20
plumber250 wrote:
Hi - The key phrase in the question is

say they know someone

I.e. for the passage to be true (as it says) the people just have to have said that they know some one. They don't actually have to have been telling the truth.

So E is the correct answer.

Hope that helps

James


Thanks James,

That was a blunder from my side. :shock:

Regards,
Arvind
Re: All of John's friends say they know someone who has smoked   [#permalink] 04 Jun 2013, 23:20
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