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Math Help - Proof these sets...

  1. #1
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    Proof these sets...

    I have try a couple of time but I can't understand these problems.
    please help me to do it...



    I prochiate your support....
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by aRTx View Post
    I have try a couple of time but I can't understand these problems.
    please help me to do it...



    I prochiate your support....
    For a), let A=\{1,2,3\} , B=\{3\} , C=\{1, 2\}, then:

    A \cup B = B \cup C = \{1,2,3\}

    but A \ne B

    This is also a counter example for b) and c)

    RonL
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