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JC Maths (H.L) Sets Question

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  • 04-11-2017 12:21am
    #1
    Elsa714
    Registered Users Posts: 13 ✭


    Would someone explain this question to me please.

    A number of people were asked which of the 3 papers - The Journal (J), The News (N) and The Tribune (T) - they had bought the previous week.

    Some of the results are shown in the Venn diagram given that
    (1) 20 people bought The News
    (2) 23 people bought The Journal
    (3) 10 people bought The Journal and The Tribune
    (4) 8 people bought The Tribune only.

    Given that there 40 people in the survey who bought The Tribune or The Journal or both, fine the value of x.

    J ∩ N = 2
    J ∩ N ∩ T = 4
    N ∩ T = x


Comments

  • Options
    #2
    skippy1977
    Registered Users Posts: 284 ✭✭skippy1977


    Looks like there is something wrong with the question.

    J ∩ N = 2
    J ∩ N ∩ T = 4

    There can't be 4 that bought all three but only 2 that bought Journal and the News. Are you sure it is written like that?


  • Options
    #3
    Elsa714
    Registered Users Posts: 13 ✭Elsa714


    Yes I'm pretty sure. I looked at the answers and x = 9, but I don't understand how you get 9.


  • Options
    #4
    skippy1977
    Registered Users Posts: 284 ✭✭skippy1977


    Have you a picture of it?


  • Options
    #5
    Elsa714
    Registered Users Posts: 13 ✭Elsa714


    Yes here it is:

    file:///C:/Users/Joseph/Pictures/Saved%20Pictures/thing%20%232.jpg

    The Venn diagram:

    file:///C:/Users/Joseph/Pictures/Saved%20Pictures/thing.jpg


  • Options
    #6
    sryanbruen
    Registered Users Posts: 13,506 ✭✭✭✭sryanbruen


    Em we can't see the pictures with those "user" links.

    Use a site like Imgur and then use the add image function of Boards.ie.

    Photography site - https://www.sryanbruenphoto.com/

    Weather photo portfolio - https://sryanbruen.myportfolio.com/weather-1



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  • Options
    #7
    Aibhif
    Registered Users Posts: 9 ✭Aibhif


    Sent u a PM last wk Elsa714 regarding answer....did u get it? Have photo of answer in Imgur but not sure how to give ye access to it via boards.ie????


  • Options
    #8
    sryanbruen
    Registered Users Posts: 13,506 ✭✭✭✭sryanbruen


    Aibhif wrote: »
    Sent u a PM last wk Elsa714 regarding answer....did u get it? Have photo of answer in Imgur but not sure how to give ye access to it via boards.ie????

    Just copy the link and embed it using the add image feature or just post the URL. Plain and simple.

    Photography site - https://www.sryanbruenphoto.com/

    Weather photo portfolio - https://sryanbruen.myportfolio.com/weather-1



  • Options
    #9
    Aibhif
    Registered Users Posts: 9 ✭Aibhif


    Maybe for you! Tried posting URL and got message that I am not allowed to do so as I am a new user.... Where is add image?


  • Options
    #10
    sryanbruen
    Registered Users Posts: 13,506 ✭✭✭✭sryanbruen


    Aibhif wrote: »
    Maybe for you! Tried posting URL and got message that I am not allowed to do so as I am a new user.... Where is add image?

    Ah yeah, forgot that you're a new user. You need to have done at least 50 posts to be able to post URLs.

    You press this that you see in the picture below (though I'm guessing now that you're using a phone?). Or you can just add at the start of the link and at the end of the link.

    So you will need to do 50 posts before doing this I think also.

    orGLuGo.png

    Photography site - https://www.sryanbruenphoto.com/

    Weather photo portfolio - https://sryanbruen.myportfolio.com/weather-1



  • Options
    #11
    sryanbruen
    Registered Users Posts: 13,506 ✭✭✭✭sryanbruen


    As Aibhif cannot post images/links, here it is for you Elsa714:

    aXEeD0w.jpg

    Photography site - https://www.sryanbruenphoto.com/

    Weather photo portfolio - https://sryanbruen.myportfolio.com/weather-1



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    #12
    Elsa714
    Registered Users Posts: 13 ✭Elsa714


    Thanks so much sryanbruen. It was clearly understandable and I hope you will be able to help me in the future.


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