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Ellen: All three of Shirley's children have the measles!

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Re: CR-children  [#permalink]

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New post 01 Nov 2011, 09:08
I fell for C too...there is a possibility that they are both wrong because Shirley's children have some other illness, therefore:

All three of Shirley's children DON'T have the measles!
As a matter of fact, all three of Shirley's children are NOT fine!
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Re: CR-children  [#permalink]

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New post 01 Nov 2011, 12:16
B.

Who says children who dont have measles are always fine? Maybe they're having other problems. ;)
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Re: CR-children  [#permalink]

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New post 03 Nov 2011, 02:01
E - Win
L - Lose

E - Win
L - Win

E - Lose
L - Win

E - Lose
L - Lose

Which of the following must be true? Actually with the given information we can only predict both are wrong. We don't have enough information to predict the others. The first scenario is ruled out by assumption.
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Re: CR-children  [#permalink]

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New post 03 Nov 2011, 02:51
IMO-C

Nobody != Measels= Fine
Reverse is Everybody= measles != fine

Hence both the statements cannot be correct. Therefore C is the best option.
Can someone please confirm.To me the OA seems incorrect.
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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 01 Nov 2012, 06:23
Is it really necessary that there can be only person with the name Sherlie.?
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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 01 Nov 2012, 09:56
The correct answer is B. The reason I think is, consider a situation:

1 of the children has measles, 2 of them are fine.

In this case both E and L are wrong. So it is entirely possible that both are mistaken about the children.
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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 01 Nov 2012, 11:58
This question is a real pain in the rear. I picked C at first, but I believe it is B based on what other members have said.

It is possible that the children do not have measles, they could be sick with something else.. Or two could have measles, one is fine.. etc. (Thus, we cannot make the blanket statement about all 3) Therefore, we cannot say that either Lois or Ellen must be correct. It is possible that both are wrong - B.
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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 01 Nov 2012, 12:24
grepro wrote:
Ellen: All three of Shirley's children have the measles!
Lois: As a matter of fact, all three of Shirley's children are fine!

Accepting the assumption that nobody who has measles is fine, which of the following must be true about this exchange?

(A) It is possible that both Ellen and Lois are right about Shirley's children.
(B) It is possible that both Ellen and Lois are mistaken about Shirley's children.
(C) Either Ellen is right about Shirley's children, or Lois is right about them, but they cannot both be right.
(D) Ellen and Lois might both be right about Shirley's children, and they might both be wrong about them.
(E) None of these alternatives correctly identifies the possibilities for this scenario.


Option C is the best in my viewpoint.....how can B be the right????children ither have measle or they dn't have it,,,can somebody explain flaw in my choice of answer...
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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 01 Nov 2012, 13:24
B for me too! Interesting question.

Both can be wrong as the discussion is about three children. If only one or maximum two of them have measles, then both are wrong since both the statements are about "all three".

Basically, in all cases in which all three are not in the same condition, both the statements would be incorrect.

Hope this helps.
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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 12 Nov 2012, 13:58
Hi Experts,

The moment I saw C there was a hint of skepticism as it seems too clear and direct answer!

The bigger take away from this question is not the correct answer, but try to understand how gmat can trick us! (if this is a valid gmat problem).

I request experts to comment on this as to what should we take away from this kind of problem, if it's a legit gmat type problem.

To me C just seem to direct and I wanted to avoid it, but other choices didn't make much sense until I saw people's post here.

thanks
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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 13 Nov 2012, 05:16
grepro wrote:
Ellen: All three of Shirley's children have the measles!
Lois: As a matter of fact, all three of Shirley's children are fine!

Accepting the assumption that nobody who has measles is fine, which of the following must be true about this exchange?

(A) It is possible that both Ellen and Lois are right about Shirley's children.
(B) It is possible that both Ellen and Lois are mistaken about Shirley's children.
(C) Either Ellen is right about Shirley's children, or Lois is right about them, but they cannot both be right.
(D) Ellen and Lois might both be right about Shirley's children, and they might both be wrong about them.
(E) None of these alternatives correctly identifies the possibilities for this scenario.


I went with option C and here is the explanation for my choice. I'll strict my explanation to only option B and C, since the discussions so far are only on these 2 options.

Let me start with my reason for rejection of option B:

The question says based on X assumption, which of the following must be true?

Option B says that It is possible that both Ellen and Lois are mistaken about Shirley's children.

Actually, no matter what Ellen and Louis say (you can forget about the passage also), this statement is always true. Because it is always "possible" for any two statements to be mistaken together. (Try to think of a situation where it is not even possible for both of them to be mistaken) There really is no need of any assumptions or premises, this statement always holds (only exception is when one says X is true and other says Not X is true).

S, if we say that option B must be true for this exchange, we are not really concluding anything.

Due to such a general nature of option B, I ignored it.

Option C says that:
Either Ellen is right about Shirley's children, or Lois is right about them, but they cannot both be right.

It says that both cannot be right together, which is true if the given assumption holds. Besides, it also leaves room for "both can be wrong". While some of the people have argued that option C means that one of E and L has to be correct, I don't agree.

As per Merriam Webster dictionary, either or means: (http://www.merriam-webster.com/dictionary/either-or)
an unavoidable choice or exclusive division between only two alternatives.

So, here if "either or" only means exclusive choice, not the unavoidable one, then both of them can be wrong.

Thus, option C is correct.

If anyone has any questions, please feel free to ask.

Regards,
CJ
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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 13 Nov 2012, 14:03
Hi,

I posted about this question on Manhattan forums and got an expert to comment on it. The answer was quite what I expected.
This question is not a gmat, but a LSAT type question.

Friends please don't post LSAT questions on gmat forums. The point is not to just randomly solve any CR question but to see/solve more GMAT like questions.

thanks!

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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 20 Feb 2013, 11:30
I went in for C too , but after reading in the responses.. alright B it is. But, isn't it easy to justify an answer when u know it is right ? I m so worried coz i would any day pick C . No ways i would pick the B on my exam :?
Any tips to help analyze answers better??? :?:
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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 09 Aug 2013, 01:47
I thought it would be C...but then going through the posts here B looks like the winner.. :)
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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 09 Aug 2013, 10:42
grepro wrote:
Ellen: All three of Shirley's children have the measles!
Lois: As a matter of fact, all three of Shirley's children are fine!

Accepting the assumption that nobody who has measles is fine, which of the following must be true about this exchange?

(A) It is possible that both Ellen and Lois are right about Shirley's children.
(B) It is possible that both Ellen and Lois are mistaken about Shirley's children.
(C) Either Ellen is right about Shirley's children, or Lois is right about them, but they cannot both be right.
(D) Ellen and Lois might both be right about Shirley's children, and they might both be wrong about them.
(E) None of these alternatives correctly identifies the possibilities for this scenario.


If there is an answer choice 'Ellen' is wrong and Lois is right... should it be the correct answer? Please help me understand.
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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 09 Aug 2013, 10:49
GMATSPARTAN wrote:
grepro wrote:
Ellen: All three of Shirley's children have the measles!
Lois: As a matter of fact, all three of Shirley's children are fine!

Accepting the assumption that nobody who has measles is fine, which of the following must be true about this exchange?

(A) It is possible that both Ellen and Lois are right about Shirley's children.
(B) It is possible that both Ellen and Lois are mistaken about Shirley's children.
(C) Either Ellen is right about Shirley's children, or Lois is right about them, but they cannot both be right.
(D) Ellen and Lois might both be right about Shirley's children, and they might both be wrong about them.
(E) None of these alternatives correctly identifies the possibilities for this scenario.


If there is an answer choice 'Ellen' is wrong and Lois is right... should it be the correct answer? Please help me understand.


no that will be wrong option .

here question is MUST BE TRUE.

see option B covers every possibility.

b) It is possible that both Ellen and Lois are mistaken about Shirley's children.
it says that it is POSSIBLE (means not 100 %) that both are mistaken.
POSSIBLE ==>plays the key role.
it covers: both are wrong
both are right
or either one is wrong and either one right ..hence this is true.

as per your choice:
'Ellen' is wrong and Lois is right.==>you are giving only one case....==>you are leaving the remaining possiblity.

hope i made it clear.
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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 30 Oct 2013, 07:50
Question stem states this: nobody who has measles is fine (Implying, people with measles are not fine.). We have to contradict this.

Ans. B - Children don,t have measles and they are not fine. (Contradiction that we are looking for!) correct Ans.

Ans. C - (Both of this support the assumption)
1. Children have measles and are not fine. or
2. Children don,t have measles and are fine.

Correct Ans. Choice - B
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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 30 Oct 2013, 10:11
Imo B, for the following reason:

The cases that are presented for the children are that they either A) have measels or B) are fine. All we are told is that children cannot be fine AND have measels. The important information is what is NOT said. It does not qualify what is entailed in being "fine" other than that one cannot be fine and have measels. It follows, then, that it is possible to not be fine but also not to have measels. That is how both ladies could be wrong. C is not a good answer because of the possibility that the children could be not fine for some other reason but could also not have measels.

Hope that makes sense.

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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 30 Oct 2013, 10:18
Definitely B.

The assumption says "anybody who has measles is not fine". However, it doesn't mean that anybody who does not have measles is fine. He/she may have some other disease.
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Re: Ellen: All three of Shirley's children have the measles!  [#permalink]

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New post 11 Nov 2013, 11:57
went with C......but after reading the comments B is indeed correct...
quite a tricky question.....would have picked C in the exam without second thoughts.
Re: Ellen: All three of Shirley's children have the measles! &nbs [#permalink] 11 Nov 2013, 11:57

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