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Need help with discrete math!

  1. Feb 16, 2012 #1
    Here's the problem.

    Theorem: If n^2+1 is odd, then n is even. Give indirect proof.
  2. jcsd
  3. Feb 16, 2012 #2
    What have you thought to do? I would suggest thinking about the properties of even/odd numbers.

    Also, I believe this is in the wrong section. It should be in math, not physics.
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