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2. Robot combinations | Crowds | Computer animation | Khan Academy

Walks through the solution to the two-headed robot problem, checking the multiplication principle against a full count of the possibilities. A short answer video that confirms the method works before the setups get trickier.

Khan Academy Labs · 1 min · Advanced · ANI · Animation · 2016

What you take away

Verify a combinatorics answer by cross-checking the formula against a direct count.

Watch it

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