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Math Help - Intersection and Union problem

  1. #1
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    Intersection and Union problem

    How do I do this? Freshman in need of serious help

    A={3,6,7,12} B={1,3,5,7,15} C={6,7,11,15}
    (A"union"B)"intersection"C
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  2. #2
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    Answer my question

    People please answer. I don't have the symbol for union and intersection on my laptop. That's why I put the words in parenthesis.
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  3. #3
    Senior Member tukeywilliams's Avatar
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     A \cup B = \{1,3,5,6,7,12,15 \}

     (A \cup B) \cap C = \{6,7,15 \}
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  4. #4
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    Quote Originally Posted by tukeywilliams View Post
     A \cup B = \{1,3,5,6,7,12,15 \}

     (A \cup B) \cap C = \{6,7,15 \}
    Ok why did you get rid of the eleven. can you explain (so I can explain it in class)?
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  5. #5
    Senior Member tukeywilliams's Avatar
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    There's no  11 in  A \cup B but there is an  11 in  C . So  A \cup B and  C do not share  11 as a common element (i.e. the intersection between these two sets does not contain  11 ).
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  6. #6
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    Replying to your good answers

    Quote Originally Posted by tukeywilliams View Post
    There's no  11 in  A \cup B but there is an  11 in  C . So  A \cup B and  C do not share  11 as a common element (i.e. the intersection between these two sets does not contain  11 ).
    Oh, I see. You only keep common numbers/elements. Sorry for seeming like a noob. My teacher didn't teach us this.
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  7. #7
    Senior Member tukeywilliams's Avatar
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    yes that is correct.
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