KnowraCombinatorial proofLinked fromLinked fromThe 8 pages that link to Combinatorial proof, each with the reason it gives.All 8Related 4Narrower topic 3Compared with 1Binomial theoremNarrower topic: Choosing factors that contribute b gives a counting proof for each coefficient.Vandermonde's identityNarrower topic: Vandermonde's identity admits a direct argument by partitioning a chosen subset.Hockey-stick identityNarrower topic: The identity follows by counting subsets according to their largest selected element.