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19 July 2016

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• curprev 07:0307:03, 19 July 2016 1=2 talk contribs 772 bytes +772 Created page with "==Problem== Let <math>\, |U|, \, \sigma(U) \,</math> and <math>\, \pi(U) \,</math> denote the number of elements, the sum, and the product, respectively, of a finite set <math..."