Binomial Coefficients
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
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.
Show
Row four reads 1, 4, 6, 4, 1 — the middle entry is C(4, 2) = 6, two spots chosen from four.
Builds on
- Nothing — this is a starting point.
Unlocks
- Nothing yet depends on this.