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Homework Help: 2.2 Set Operations: Discrete Mathematics and its application

  1. Oct 5, 2008 #1
    page.130 Ex.20

    Show that if A and B are sets, then (A[tex]\cap[/tex]B) [tex]\bigcup[/tex] (A[tex]\cap[/tex]B) = A.

    how do u solve this?

    3. The attempt at a solution
  2. jcsd
  3. Oct 5, 2008 #2


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    You can't. It's false.
  4. Oct 5, 2008 #3


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    did you possibly mis-type? Do you mean to show

    (A \cap B) \cup (A - B) = A
  5. Oct 14, 2008 #4
    I'm having trouble with this question as well. The second B has a line above it if that means anything. Please help me.
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