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Math Help - Number Theory

  1. #1
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    Number Theory

    Let a be an even integer. then a^2 is congruent to 0mod4.
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    Hello,
    Quote Originally Posted by JCIR View Post
    Let a be an even integer. then a^2 is congruent to 0mod4.
    Oh !!! You could've thought a bit for this one !

    a is an even integer ---> a=2k, where k is an integer.

    Therefore, aČ=...
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