23 December 2019

• curprev 12:1012:10, 23 December 2019 Skyguy88 talk contribs 2,189 bytes +1,668 →Solution

13 January 2019

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26 November 2016

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19 October 2014

• curprev 21:5021:50, 19 October 2014 Timneh talk contribs 466 bytes +466 Created page with "== Problem == Let <math>S = \left \{a,b,c,d \right \}</math> be a set of four positive integers. If pairs of distinct elements of <math>S</math> are added, the following six sum..."