Revision history of "Talk:2013 AMC 12A Problems/Problem 20"

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  • (cur | prev) 19:16, 25 November 2019Vsamc (talk | contribs). . (145 bytes) (+145). . (Created page with "Disucssion: COuld someone please explain how you got the first set of conditions is <math>45*10-\sum_{k=1}^{9}\dbinom{k+1}{2}</math>? Thank you!")
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