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All of John's friends say they know someone who has smoked 40 cigarett

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All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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A
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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.

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Originally posted by tenaman10 on 19 Jul 2009, 05:12.
Last edited by Bunuel on 30 Oct 2018, 00:16, edited 2 times in total.
Renamed the topic and edited the question.
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Re: All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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New post 02 Jul 2010, 20:19
8
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 40 cigarett  [#permalink]

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New post 19 Jul 2009, 09:55
- Since, John is not unique, some of the friends must not know the smoker, so some of them are lying.

(A) Smoking often lie about how much they smoke.
- No relation.

(B) People often knowingly exaggerate without intending to lie.
- No relation.

(C) All John's friends know the same lifelong heavy smoker.
-'Lifelong heavy smoker' is never mentioned in passage.

(D) Most of John's friends are not telling the truth.
- We can not conclude on 'most' part.

(E) Some of John's friends are not telling the truth.
-My take. This one is the answer.


Can you please confirm ?
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Re: All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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New post 19 Jul 2009, 19:46
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E because "he is not unique" means some of his friends do not know that fact, but the stem says "all of his friends know". So some of his friends must lie...
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Re: All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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New post 20 Jul 2009, 01:23
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Has to be E Since
Arg 1) "All of John's friends say they know someone ..."
Arg 2) "John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect."

Since "all" of John;s friend say they know someone and John believe he doesn't know and he is not "unique" then definetely some of his friends are lying. :)
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Re: All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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New post Updated on: 02 Mar 2010, 13:28
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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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Originally posted by azule45 on 01 Mar 2010, 13:39.
Last edited by azule45 on 02 Mar 2010, 13:28, edited 1 time in total.
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Re: All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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New post 02 Mar 2010, 12:54
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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

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 40 cigarett  [#permalink]

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New post 02 Mar 2010, 17:41
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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 40 cigarett  [#permalink]

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New post 08 Jul 2010, 01:45
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 40 cigarett  [#permalink]

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New post 08 Jul 2010, 11:23
RenukaD 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.
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Re: All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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New post 03 Dec 2010, 07:40
I don't fully understand the difference b/n some and most. Some could mean half, less than half or more than half most means definitely more than half. Am I right? And if that is the case how would one be able to tell the difference between the two choices? :roll:
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Re: All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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New post 03 Dec 2010, 11:51
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mariyea wrote:
I don't fully understand the difference b/n some and most. Some could mean half, less than half or more than half most means definitely more than half. Am I right? And if that is the case how would one be able to tell the difference between the two choices? :roll:


Some means 'at least 1'.
Most means 'greatest quantity'.
e.g. He got the most votes.
If there were 3 people, he could have had 40 votes. So it isn't necessarily more than half. Just 'any majority'.
Most of his friends would imply more than 50% since there will be two groups only - his friends who are telling the truth and his friends who are not telling the truth.

We can say that at least 1 of his friends is lying (so that he is not unique). There is no reason to say that more than 50% of his friends are lying.
Though, ambiguous question according to GMAT standards. I wouldn't worry about it.
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Re: All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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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: All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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New post 29 Mar 2015, 12:27
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souvik101990 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.


Found the passage tough. Here's my reasoning
A - is irrelevant to this passage. The passage never talks about what smoke think
B - 'intention' is irrelevant to the passage
C - 'All' is an extreme word and the truth of this answer choice can not be proved beyond reasonable doubt with information in the passage
D - 'Most' (>50%) can not be proved
E - Some (anything between 1 and 100) is OK. This can be proved - as the John says he is not 'unique'. Hence correct answer
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Re: All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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New post 12 Jul 2016, 22:45
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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. ........>Could be true
(B) People often knowingly exaggerate without intending to lie. .......>outside the scope of the fact sets
(C) All John’s friends know the same lifelong heavy smoker. .....>the statement must be false since some of John's friends don't know about the smoker(According to the highlighted portion of the sentence,he is not unique=some of his friends still in his situation of not knowing ),but the question asked about must be true answer choice.
(D) Most of John’s friends are not telling the truth. ........Could be true because most of John's friends may not know the fact of the smoker
(E) Some of John’s friends are not telling the truth. ......> some of John’s friends= means at-least one of John's friends.information must be true as the fact

Correct Answer E
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Re: All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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New post 24 Jul 2016, 06:45
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

Why cant c be OA?


This is a very bad, incorrect and third rate question.
No one who has an iota of knowledge of Logic or reasoning would make such a question.

For all logic and critical reasoning , there is no difference in "Most/many/some/not all".
In logic ---> 1=some=many=99= not all
In logic ---> 0 = None
In logic ---> 100 = all

Therefore answer D and E are both correct.
A GMAT question cannot have 2 correct answers.


Remember quantifier like all, not all , some, many and none have different meaning in logic than in English.
Quantifiers in Logic are more similar to mathematical symbolism and has a close relationship with set theory. such as Union, intersection, null set and so on.

THIS IS A BLATANTLY WRONG QUESTION AND SHOULD BE DELETED WITHOUT GIVING IT A SECOND THOUGHT.

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Re: All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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New post 05 Feb 2017, 22:30
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IMO, since John is NOT UNIQUE ->he is the same with SOME or MOST of his friends (say another way, he is the same at least ONE of his friends)
Let take an example set of 100 John's friends:
SOME has wider range of possibilities (1-100), and MOST (51-100) is a subset of SOME
So, E is a Must be True
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Re: All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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New post 02 Jul 2017, 22:50
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This is an awesome question as it helps understand that how a simple word "some" and "all" can change the whole scenario.
Suppose John has 10 friends and all know someone who is smoking since last 40 years. John is the only one who knows no one. The argument says "john isnt unique" it means he is same as his friends. Now saying that all of his friends (10 friends) are lying. well, isnt it extreme to say that all are lairs? but it isnt extreme to say that some of John's friends are lying...so E is the right option.
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Re: All of John's friends say they know someone who has smoked 40 cigarett  [#permalink]

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