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Divisibility & congruences

  1. Mar 15, 2009 #1
    which elements of Z/60 are invertible?? what are their inverses?

    do we have any quick way to do this kind of question??
     
  2. jcsd
  3. Mar 15, 2009 #2

    CRGreathouse

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    Hint: gcd(n, 60).
     
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