Im having trouble with this proof: Let n be an integer, prove that if n^2 is divisible by three then n is divisible by three.
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Originally Posted by jsteel2 Im having trouble with this proof: Let n be an integer, prove that if n^2 is divisible by three then n is divisible by three. Simply substitute in $\displaystyle n:=3m$, and evaluate using the fact that $\displaystyle (ab)^x = a^xb^x$.
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