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6. Binomial coefficient | Crowds | Computer animation | Khan Academy

Derives the binomial coefficient, n choose k, from the factorial work earlier in the unit and shows it as the general formula behind every casting problem covered so far. Closes out the Crowds unit by tying combinatorics directly back to populating a Monsters University-style crowd.

Khan Academy Labs · 3 min · Advanced · ANI · Animation · 2016

What you take away

Compute n choose k and explain what it counts.

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