This is a MAML (Maine Association of Math Leagues) problem from October 2000 (Meet 1 of 2000-2001), Round 1, Problem 3: http://maml.net/problems.htm
Also, this was recorded with gtk-recordMyDesktop: http://recordmydesktop.sourceforge.ne...
The math writings were made on Emacs: https://www.gnu.org/software/emacs/
I think in this video, I emphasized that today's problems were harder which is true, but they're not that much harder so don't get scared or anything.
Also, turn the captions on to understand the audio better.
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