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Zero factorial or 0! (video) | Permutations | Khan Academy
https://www.khanacademy.org/math/probability/xa88397b6:probability/counting-permutations/v/zero-factorial-or-0
10/8/2025, 3:01:49 PMID: 2af94431-e6ff-46b6-b0b8-ebc893d06f47