College Algebra / Unit 9 Alg 518 short lesson, about 20 seconds
Binomial Coefficients
Captions available
The idea
A binomial coefficient is a combination number in expansion duty: (n over r) equals C(n, r), and row n of Pascal's triangle lists them all.
In practice
Row four reads 1, 4, 6, 4, 1 — the middle entry is C(4, 2) = 6, two spots chosen from four.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
- Nothing. This is a starting point.
Unlocks
- Nothing yet depends on this.
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