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Math Help - Element Method #2

  1. #1
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    Element Method #2

    Use the element method for proving a set equals the empty set to prove the statement. Assume all sets are subsets of a universal set U.

    1. For all sets A, B, and C, if B C C and A C = , then A B = .
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  2. #2
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    Please reply with a detailed description of what is meant by the element method.
    It is pointless to give help without knowing what that means.
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