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${5\choose 2}$ Proofs that ${n\choose k} \leq {n\choose {k+1}}$ if $k - MaRDI portal

${5\choose 2}$ Proofs that ${n\choose k} \leq {n\choose {k+1}}$ if $k

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Publication:6217907

arXiv1003.1273MaRDI QIDQ6217907

Doron Zeilberger

Publication date: 5 March 2010

Abstract: There is no trivial mathematics, there are only trivial mathematicians! A mathematician is trivial if he or she believes that there exists trivial mathematics. Being a non-trivial mathematician myself, I will describe ten different proofs of the seemingly trivial fact that the number of ways of choosing k people out of n people is less than or equal to the number of ways of choosing k+1 people out of n people, provided that k is less than half of n.












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