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Please give me some examples, this is an exam question of a 1st year math module.

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    $\begingroup$ Searching the web for finite noncommutative ring finds this duplicate right here on stackexchange. math.stackexchange.com/questions/603881/… $\endgroup$ May 17 '19 at 1:09
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    $\begingroup$ Oh I see... so nxn matrices with entries on $Z_k$ work? $\endgroup$
    – user600210
    May 17 '19 at 1:11
  • $\begingroup$ Yes, one of the most obvious examples. $\endgroup$ May 17 '19 at 2:36
  • $\begingroup$ Here are at least 8 examples $\endgroup$
    – rschwieb
    May 17 '19 at 2:37