Inductive factorial sum visual proof
This is a short, animated visual proof demonstrating a finite sum involving products of factorials. The proof exploits the classic inductive proof of the formula in question.
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This animation is based on a proofs by Tom Edgar from the December 2016 issue of Mathematics Magazine page 338 (https://doi.org/10.4169/math.mag.89.5....
If you want to see a longer version, with an accompanying explanation, check out • A Factorial Sum Produces the Factoria...
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