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Confused with sufficient and necessary condition

  1. Sep 19, 2010 #1
    1. The problem statement, all variables and given/known data

    i know that "A is necessary for B" means "B implies A".

    but i confused with the word "A is necessary of B" somebody help
  2. jcsd
  3. Sep 19, 2010 #2


    Staff: Mentor

    Take a look here.
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