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Of 180 people who were asked if they had watched recent

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Of 180 people who were asked if they had watched recent [#permalink]

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New post 26 Jan 2014, 12:46
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Of 180 people who were asked if they had watched recent college basketball playoffs, 38 watched only game 1, 56 watched game 2, and 64 watched game 3. 20 people watched both game 2 and 3. Make a Venn diagram for this situation. How many people did not watch any of the games?
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Re: Of 180 people who were asked if they had watched recent [#permalink]

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New post 26 Jan 2014, 22:58
Can somebody help me out with this question please?
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Re: Of 180 people who were asked if they had watched recent [#permalink]

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New post 25 Feb 2014, 19:27
srgopinath wrote:
Of 180 people who were asked if they had watched recent college basketball playoffs, 38 watched only game 1, 56 watched game 2, and 64 watched game 3. 20 people watched both game 2 and 3. Make a Venn diagram for this situation. How many people did not watch any of the games?


This question seems to be incomplete. Whats the source & options?
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Re: Of 180 people who were asked if they had watched recent [#permalink]

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New post 25 Feb 2014, 22:09
Expert's post
srgopinath wrote:
Of 180 people who were asked if they had watched recent college basketball playoffs, 38 watched only game 1, 56 watched game 2, and 64 watched game 3. 20 people watched both game 2 and 3. Make a Venn diagram for this situation. How many people did not watch any of the games?


As directed, make a Venn diagram. You will easily get the answer.

Attachment:
Ques3.jpg
Ques3.jpg [ 24.13 KiB | Viewed 1149 times ]


The red area is 38 (Only Game 1 Watchers).
The light green region is 20 (people who watched game 2 and game 3 including people who watched all three games)
Orange and Yellow region combined will be 56 - 20 = 36 since the entire game 2 circle has 56 people.
Similarly the brown and dark green region together will be 64 - 20 = 44 since the entire game 3 circle has 64 people.

To get 'None', that is people who watch no games, from the total 180, we need to subtract people who watch at least one game i.e. all the people lying anywhere in the three circles

None = 180 - 38 - 20 - 36 - 44 = 42

NO of people who did not watch any game = 42
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Re: Of 180 people who were asked if they had watched recent [#permalink]

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New post 26 Feb 2014, 00:48
VeritasPrepKarishma wrote:
srgopinath wrote:
Of 180 people who were asked if they had watched recent college basketball playoffs, 38 watched only game 1, 56 watched game 2, and 64 watched game 3. 20 people watched both game 2 and 3. Make a Venn diagram for this situation. How many people did not watch any of the games?


As directed, make a Venn diagram. You will easily get the answer.

Attachment:
Ques3.jpg


The red area is 38 (Only Game 1 Watchers).
The light green region is 20 (people who watched game 2 and game 3 including people who watched all three games)
Orange and Yellow region combined will be 56 - 20 = 36 since the entire game 2 circle has 56 people.
Similarly the brown and dark green region together will be 64 - 20 = 44 since the entire game 3 circle has 64 people.

To get 'None', that is people who watch no games, from the total 180, we need to subtract people who watch at least one game i.e. all the people lying anywhere in the three circles

None = 180 - 38 - 20 - 36 - 44 = 42

NO of people who did not watch any game = 42



Thanks a lot. I did create a Venn diagram, but missed the step highlighted

None = 180 - 38 - 20 - 36 - 44 = 42
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Re: Of 180 people who were asked if they had watched recent [#permalink]

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New post 09 Jun 2014, 09:27
Here we are assuming that none has watched games 1 and 2, and 2 and 3. if that is true answer should be 42. Question does not look like a proper gmat style question.
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Re: Of 180 people who were asked if they had watched recent [#permalink]

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New post 09 Jun 2014, 20:55
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PiyushK wrote:
Here we are assuming that none has watched games 1 and 2, and 2 and 3. if that is true answer should be 42. Question does not look like a proper gmat style question.


Note that we are not assuming that no one watched games 1 and 2 and games 2 and 3. What we know is that 36 people watched either only game 2 or only games 1 and 2 (not game 3). Similarly, we know that 44 people watched only game 3 or games 1 and 3 (not game 2). We don't need to segregate the numbers i.e. we don't need how many people watched only game 3 and how many watched games 1 and 3. They are all people who watched at least 1 game and hence we remove them from 180. We are interested in people who watched no game.

Go back to the venn diagram given above and read the explanation given below it.
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Re: Of 180 people who were asked if they had watched recent   [#permalink] 09 Jun 2014, 20:55
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