“Solutions to the Challenges.” Charming Proofs: A Journey into Elegant Mathematics, by Claudi Alsina and Roger B. Nelsen, 1st ed., vol. 42, Mathematical Association of America, 2010, pp. 239–274, www.jstor.org/stable/10.4169/j.ctt6wpwnz.17. Accessed 27 May 2020.
Alsina, C., & Nelsen, R. (2010). Solutions to the Challenges. In Charming Proofs: A Journey into Elegant Mathematics (pp. 239-274). Mathematical Association of America. Retrieved May 27, 2020, from www.jstor.org/stable/10.4169/j.ctt6wpwnz.17
Alsina, Claudi, and Roger B. Nelsen. "Solutions to the Challenges." In Charming Proofs: A Journey into Elegant Mathematics, 239-74. Mathematical Association of America, 2010. Accessed May 27, 2020. www.jstor.org/stable/10.4169/j.ctt6wpwnz.17.
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