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

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Senior Manager
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All of John s friends say they know someone who has smoked [#permalink]

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01 Mar 2010, 11:54
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Question Stats:

54% (02:17) correct 46% (01:36) wrong based on 196 sessions

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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) Smokers 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
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Re: All of John s friends say they know someone who has smoked [#permalink]

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01 Mar 2010, 14:39
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i thought it was among B, D, and E. since "most" and "some" seem pretty strong, i figured it would be B.

as far as C, the stimulus says that John doesn't know anyone who smokes in such a manner and he is sure that not ALL of his friends know someone who does. so in this respect, at least 1 of his friends does not know anyone who smokes 40 cigs a day neither. therefore, the idea that ALL of his friends know the same smoker must be false. this is my reason for disregarding C.

anyone know why its E? what is the difference (at least by gmat standards) between "most" and "some"?
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Last edited by azule45 on 02 Mar 2010, 14:28, edited 1 time in total.
Senior Manager
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Re: All of John s friends say they know someone who has smoked [#permalink]

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02 Mar 2010, 13:54
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vaivish1723 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) Smokers 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.

Oa is
[Reveal] Spoiler:
e

Why cant c be OA?

I first opted for C.
But i think there is a valid logic behind E.

C can be rejected on the basis of the premise that John is not unique, means he is not the only guy who doesn't know heavy smoker.

Let's say there are 10 guys including John. If we choose option C, it means 9 guys know heavy smoker and John becomes unique.

In option E, lets say 7 guys know (they say so)heavy smoker, and 2 are just lying for one reason or another, but they say they know, then actually John is not the only one who doesn't know the heavy smoker. And also the condition that "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" is fulfilled.

FINALLY E.
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Re: All of John s friends say they know someone who has smoked [#permalink]

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02 Mar 2010, 18:41
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It has to be E. Statement says that "All of John’s friends say", then it indicates that "John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect". That means that some of John's friends are untruthful. Most will not work as we don't know how many.
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Re: All of John s friends say they know someone who has smoked [#permalink]

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04 Mar 2010, 21:05
if jhon is not unique then he is more likely to similar to his friends in all aspects

if jhon his telling the truth then most of his friends will also tell truth

so ans E is the correct answer
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Re: All of John s friends say they know someone who has smoked [#permalink]

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05 Mar 2010, 03:46
John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.
=> John and some of his friends do not Know of a person who had been smoking ...etc etc

Option E clearly follows from this statement.
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Re: All of John s friends say they know someone who has smoked [#permalink]

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02 Jul 2010, 14:56
Thanks boss...well explained yet again..

nverma wrote:
vaivish1723 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) Smokers 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.

Oa is
[Reveal] Spoiler:
e

Why cant c be OA?

I first opted for C.
But i think there is a valid logic behind E.

C can be rejected on the basis of the premise that John is not unique, means he is not the only guy who doesn't know heavy smoker.

Let's say there are 10 guys including John. If we choose option C, it means 9 guys know heavy smoker and John becomes unique.

In option E, lets say 7 guys know (they say so)heavy smoker, and 2 are just lying for one reason or another, but they say they know, then actually John is not the only one who doesn't know the heavy smoker. And also the condition that "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" is fulfilled.

FINALLY E.
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Re: All of John s friends say they know someone who has smoked [#permalink]

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02 Jul 2010, 21:19
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Hi,

in inference questions that ask for what "must be true?", it is a great strategy to deal with every statement as a fact. A big mistake many people make with this question type is to identify conclusion and evidence. There's no point in doing that.

What you should do is exactly this:

--treat every sentence as a fact, as true--no doubt about it
--see if you can combine the facts to arrive at a deduction
--aggressively scan for a choice that matches that deduction (you don't have to decide whether a choce is right or wrong the first time you read it--you just go through the choices aggressively looking for one that matches your prediction)
--select that choice, not care one whit about the other choices, and move on.

Let's do that here.

The first sentence is pretty easy to understand: All of Jon's friends say they know a heavy smoker who is, yet, healthy. But the second sentence tells us that John doesn't know anyone like that, and we also know it must be true that:

Quote:
it is quite certain that he is not unique among his friends in this respect

Therefore, despite what they "say", at least one of his friends is lying--that's it, that's our deduction.

Let's scan for the match..

Then, choice E clearly matches.

The passage does not establish that all of John's friends know the same life-long smoker. If we deny choice C--if John's friends didin't all know the same smoker--then no part of the passage is falsified. Thus, the passage has not proved that choice C must be true.
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Re: All of John s friends say they know someone who has smoked [#permalink]

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02 Jul 2010, 23:11
Hi TestLuv - kudos to your clarity of thought. I wish I had the time so I would have compiled these nuggets into a CR 101. Well... at some point perhaps... I am scheduled for 9th Aug 2010.
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Re: All of John s friends say they know someone who has smoked [#permalink]

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03 Jul 2010, 07:11
Testluv wrote:
Hi,

in inference questions that ask for what "must be true?", it is a great strategy to deal with every statement as a fact. A big mistake many people make with this question type is to identify conclusion and evidence. There's no point in doing that.

What you should do is exactly this:

--treat every sentence as a fact, as true--no doubt about it
--see if you can combine the facts to arrive at a deduction
--aggressively scan for a choice that matches that deduction (you don't have to decide whether a choce is right or wrong the first time you read it--you just go through the choices aggressively looking for one that matches your prediction)
--select that choice, not care one whit about the other choices, and move on.

Let's do that here.

The first sentence is pretty easy to understand: All of Jon's friends say they know a heavy smoker who is, yet, healthy. But the second sentence tells us that John doesn't know anyone like that, and we also know it must be true that:

Quote:
it is quite certain that he is not unique among his friends in this respect

Therefore, despite what they "say", at least one of his friends is lying--that's it, that's our deduction.

Let's scan for the match..

Then, choice E clearly matches.

The passage does not establish that all of John's friends know the same life-long smoker. If we deny choice C--if John's friends didin't all know the same smoker--then no part of the passage is falsified. Thus, the passage has not proved that choice C must be true.

deserves kudos.!
+1 from me
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Re: All of John s friends say they know someone who has smoked [#permalink]

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03 Jul 2010, 11:33
Good One... Nice Explanation
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Re: All of John s friends say they know someone who has smoked [#permalink]

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06 Jul 2010, 10:34
I went for D but now clearly understand that it should be E.
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Re: All of John s friends say they know someone who has smoked [#permalink]

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06 Jul 2010, 19:39
marked B ...but I undrstand its E thnx
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Re: All of John s friends say they know someone who has smoked [#permalink]

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07 Jul 2010, 15:20
Testluv wrote:
Hi,

in inference questions that ask for what "must be true?", it is a great strategy to deal with every statement as a fact. A big mistake many people make with this question type is to identify conclusion and evidence. There's no point in doing that.

What you should do is exactly this:

--treat every sentence as a fact, as true--no doubt about it
--see if you can combine the facts to arrive at a deduction
--aggressively scan for a choice that matches that deduction (you don't have to decide whether a choce is right or wrong the first time you read it--you just go through the choices aggressively looking for one that matches your prediction)
--select that choice, not care one whit about the other choices, and move on.

Let's do that here.

The first sentence is pretty easy to understand: All of Jon's friends say they know a heavy smoker who is, yet, healthy. But the second sentence tells us that John doesn't know anyone like that, and we also know it must be true that:

Quote:
it is quite certain that he is not unique among his friends in this respect

Therefore, despite what they "say", at least one of his friends is lying--that's it, that's our deduction.

Let's scan for the match..

Then, choice E clearly matches.

The passage does not establish that all of John's friends know the same life-long smoker. If we deny choice C--if John's friends didin't all know the same smoker--then no part of the passage is falsified. Thus, the passage has not proved that choice C must be true.

Nicely done, Kudos for you:)
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Re: All of John s friends say they know someone who has smoked [#permalink]

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08 Jul 2010, 02:45
E looks fine to me but at the same time A can also be a contender. Expert pls advise what is wrong with A?
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Re: All of John s friends say they know someone who has smoked [#permalink]

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08 Jul 2010, 12:23
E looks fine to me but at the same time A can also be a contender. Expert pls advise what is wrong with A?

Hi,

we can't infer anything about smokers themselves lying. We can infer that some people who say they know healthy heavy smokers are lying.
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Re: All of John s friends say they know someone who has smoked [#permalink]

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08 Jul 2010, 19:57
Testluv wrote:
E looks fine to me but at the same time A can also be a contender. Expert pls advise what is wrong with A?

Hi,

we can't infer anything about smokers themselves lying. We can infer that some people who say they know healthy heavy smokers are lying.

Thanks Testluv . Now it is clear to me
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Re: All of John s friends say they know someone who has smoked [#permalink]

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04 Aug 2010, 00:47
alexBLR thanks ...........good explanation .....I was floored and went for B.....
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Re: All of John s friends say they know someone who has smoked [#permalink]

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12 Sep 2010, 03:58
Different
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Re: All of John s friends say they know someone who has smoked [#permalink]

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13 Sep 2010, 02:42
I went with 'C'..Didnt understand the 'unique' part.Now its clear..
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Re: All of John s friends say they know someone who has smoked   [#permalink] 13 Sep 2010, 02:42

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