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Math Help - Bit of a rush

  1. #1
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    Bit of a rush

    How does this work

    d = inverse of 13 mod 12

    what is d

    help please!!!
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  2. #2
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    Quote Originally Posted by jzon
    How does this work

    d = inverse of 13 mod 12

    what is d

    help please!!!
    You need an x such as,
    13x\equiv 1\mod 12
    Which can be rewritten as,
    (13-12)x\equiv 1\mod 12
    Thus,
    x\equiv 1\mod 12
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  3. #3
    Newbie
    Joined
    Apr 2006
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    made a mistake

    d is the inverse of 7 mod120

    oops!!!!

    my bad

    cheers
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