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3. Calculating factorials | Crowds | Computer animation | Khan Academy

Introduces factorial notation as the count of ways to arrange a full set of items in sequence, the building block behind the casting problems Pixar's crowd artists solve for background characters. Works through a small example before scaling it up.

Khan Academy Labs · 2 min · Advanced · ANI · Animation · 2016

What you take away

Compute n! and explain why it counts every ordering of n distinct items.

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