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So do we post our answers and get downvoted if wrong? (and sometimes anyway)

It's hard to beat an elegant site like this that we're already registered for, but I'm having trouble visualizing matrices in this markup.

  [ 1 0 0 ]
  [ 0 1 0 ]
  [ 0 0 1 ]
OK, worth a shot.



It may be good to hide solutions behind a pastebin link, rather than directly including them in a comment & spoiling things.


I'd think we'd mostly be saying "I liked this" or "I didn't understand that", not so much quizzing. But I don't know, never done this before.

Can always link pictures to threads if ASCII gets too hard.


As long as we don’t need to use MathML. I can’t spare an hour and a half to construct each post.




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