Verified Answer :

konrad509

The contrapositive of above is "If n is not odd then n^2 is not odd" or "If n is even then n^2 is even".

So, let assume that n is even
\(n=2k, k\in \mathbb{Z}\\\\\)
then
\(n^2=(2k)^2=4k^2\)
which is even q.e.d.




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