College Algebra / Alg 518 · Atom · ~20 seconds
Binomial Coefficients
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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.
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Row four reads 1, 4, 6, 4, 1 — the middle entry is C(4, 2) = 6, two spots chosen from four.
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