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Math Help - finite math venn diagram

  1. #1
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    Unhappy finite math venn diagram

    There are three sets:
    A = { 1, 2, 3, 4 }
    B = { 3, 5, 6, 7 }
    C = { 1, 3, 7, 8 }

    Find:


    (A⋃ B)⋂ C
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  2. #2
    Moo
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    Hello,

    Just write (A⋃ B), which will be composed of all elements of A and all elements of B.
    x € A⋃B means that x is in A OR in B (non-exclusive or, so it can be in A and B)

    Then, (A⋃ B)⋂ C will be any elements which are in (A⋃ B) AND in C.
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  3. #3
    Bar0n janvdl's Avatar
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    Quote Originally Posted by dreamer1963 View Post
    There are three sets:
    A = { 1, 2, 3, 4 }
    B = { 3, 5, 6, 7 }
    C = { 1, 3, 7, 8 }

    Find:


    (A⋃ B)⋂ C
    I like doing these problems step by step.

    Lets first find the elements of A \cup B

    A \cup B = {1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7}

    Now let's find the elements which appear in both  (A \cup B) and  C

     (A \cup B) \cap C = {1 ; 3 ; 7}
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