Pascal's identity (algebraic proof)
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Symmetry of binomial coefficients
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My favorite proof of the n choose k formula!
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Induction with Sigma Notation (4 of 4: Binomial Theorem - Pascal's Identity)
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Pascal's Identity | Combinatorial Identities Part 1
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Art of Problem Solving: Pascal's Identity
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Yaşayan en iyi matematikçinin bile çözemediği soru (Uluslararası Matematik Olimpiyatı 1988 P6)
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The strange cousin of the complex numbers -- the dual numbers.
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