I went full @3blue1brown and used Manim to illustrate the proof of the Geometric Series formulapic.twitter.com/c3kVy63SIh
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In my 1st job interview after graduating (i.e. for anything other than flipping burgers or delivering milk) they asked if I knew the (finite) geometric series formula. I couldn’t remember it, so I derived it, because frankly that’s easier than remembering if it’s x^n or x^{n+1}.
very relatable, i'm the exact same way .. the derivation is essentially one "trick" to remember, as opposed to keeping track of all of the ns and n+1 s entering and leaving your life
