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

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Re: Ellen: All three of Shirley's children have the measles! [#permalink] New post 20 Feb 2013, 10:30
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] New post 09 Aug 2013, 00:47
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] New post 09 Aug 2013, 09:42
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] New post 09 Aug 2013, 09:49
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] New post 30 Oct 2013, 06:50
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] New post 30 Oct 2013, 09:11
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] New post 30 Oct 2013, 09:18
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] New post 11 Nov 2013, 10:57
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.
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Re: Ellen: All three of Shirley's children have the measles! [#permalink] New post 21 Nov 2013, 07:51
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.

Good One what about the Shirley' have more than three children. Say He/ she have 6 children then both E& L were right at the same time ?

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Re: Ellen: All three of Shirley's children have the measles! [#permalink] New post 11 Dec 2013, 00:21
Initially picked C but later understood the possibility that if either one or two of the children have measles, then both E and L's statements could be wrong. Hence B is my second pick.

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Re: Ellen: All three of Shirley's children have the measles! [#permalink] New post 13 Dec 2013, 06:03
Lets see what can be the different cases in such scenario-
case 1 : all three have measles -> Ellen is true and Lois is false
case 2 : all three dont have measles and no other disease -> Lois is true and Ellen is fase
case 3: All three or some have disease other than measles, then they (or those some) are not fine. -> both Ellen and Lois are false
Both cant be true at the same time for sure.
Only option B suggest this. I am though little skpetical about option E. But somehow go with B because this option entails the scenario that can be correct. However, this option do not covers all scenario.. I think thats why the option starts with "It is possible" that makes B a strong contender over E.
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Re: Ellen: All three of Shirley's children have the measles! [#permalink] New post 20 Feb 2014, 11:54
c first ..then b ...

the childeren may have some other illness rather than measles.. which makes them both wrong/
coz of this possibility , c is deadly wrong
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Re: Ellen: All three of Shirley's children have the measles! [#permalink] New post 01 Mar 2014, 06:54
How do we know both El & Lois are talking about the same Shirley? It is possible that they know two Shirleys and BOTH are right... hence A.
BUT this is a "must be true" question, so B seems right. Good explanations everybody.
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Re: Ellen: All three of Shirley's children have the measles!   [#permalink] 01 Mar 2014, 06:54
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