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When 1,000 children were inoculated with a certain vaccine, [#permalink]

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25 Oct 2007, 08:42

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When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever ?

(1) 880 children developed neither inflammation nor fever (2) 20 children developed fever

It seems there is no detail about children developing inflammation and fever. It is safe to assume there is no A∩B unless it is clearly mentioned in the question?

No, you cannot assume that. It's vise-versa, if there is no overlap, then you'd be told that in one way or another.

When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever ?

(1) 880 children developed neither inflammation nor fever (2) 20 children developed fever

Obviously, smth is wrong with my brain, but I couldn't understand the OA...

When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever?

1. 880 children developed neither inflammation nor fever 2. 20 children developed fever

any thoughts?

The answer is C, combine the 2 statements and its sufficient

Re: When 1,000 children were inoculated with a certain vaccine [#permalink]

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11 May 2014, 05:48

It seems there is no detail about children developing inflammation and fever. It is safe to assume there is no A∩B unless it is clearly mentioned in the question?

Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

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03 Apr 2016, 09:26

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Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

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21 Oct 2016, 23:51

Hello,

I tried solving this question through Venn Diagram. Putting the attachment here. Could anyone please let me know where am I lacking? Total Sample = 1000 Neither I nor Fever = 880 Remaining = 120 with either Fever or Inf. or both. Fever = 20

So, only Inflammation or Inflammation and fever = 100

And hence, according to me, I can't find the answer for the question, hence Statements are insufficient.

Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

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04 Jan 2017, 08:34

Top Contributor

Bunuel wrote:

dhirajx wrote:

It seems there is no detail about children developing inflammation and fever. It is safe to assume there is no A∩B unless it is clearly mentioned in the question?

No, you cannot assume that. It's vise-versa, if there is no overlap, then you'd be told that in one way or another.

When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever ?

(1) 880 children developed neither inflammation nor fever (2) 20 children developed fever

It seems there is no detail about children developing inflammation and fever. It is safe to assume there is no A∩B unless it is clearly mentioned in the question?

No, you cannot assume that. It's vise-versa, if there is no overlap, then you'd be told that in one way or another.

When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever ?

(1) 880 children developed neither inflammation nor fever (2) 20 children developed fever

Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

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04 Jan 2017, 11:11

Top Contributor

Thanks for the quick response Bunnel. May be I am doing something wrong here and not seeing the right logic. I will appreciate your help here: I don't see two groups. I see one group of kids who can either get one ailment or another. How do we decide if the groups are two or one?
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press kudos, if you like the explanation, appreciate the effort or encourage people to respond.

Thanks for the quick response Bunnel. May be I am doing something wrong here and not seeing the right logic. I will appreciate your help here: I don't see two groups. I see one group of kids who can either get one ailment or another. How do we decide if the groups are two or one?

Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

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21 Mar 2017, 23:29

[quote="elgo"]When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever ?

(1) 880 children developed neither inflammation nor fever (2) 20 children developed fever[/quote

In order to solve this question we need to know the number of children who developed neither and the number of children who developed fever- it is important to note this is a binary group- based on the stimulus it is assumed that there is no group that developed inflammation and fever at the site of inoculation.

Statement (1) gives us only one piece of the equation. Insufficient

Statement (2) still leaves us with the variable of the number of children who developed neither inflammation nor fever. Insufficient.

Statement (1) and Statement (2) together allow us the calculate the number of children who developed inflammation- only because there is no overlap with these groups

Total= A + B - Neither ( in this scenario A cannot be A + C (overlap) because it is inferred from the problem, again, you either have developed inflammation or have developed a fever) 1000= A + 20- 880 120= A + 20 100= A

Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

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22 Mar 2017, 02:32

elgo wrote:

When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever ?

(1) 880 children developed neither inflammation nor fever (2) 20 children developed fever