jimcavoli
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 Jun 19 awarded Supporter Jun 19 comment How many unique combinations you can have when pairing 17 designs into a 7 set? Also, the ! is the factorial - in brief, the product $n(n-1)(n-2)...(2)(1)$ - see more about factorials at en.wikipedia.org/wiki/Factorial as well for a proper formal definition and examples. Jun 19 comment How many unique combinations you can have when pairing 17 designs into a 7 set? Which is also, for reference, equal to $\frac{n!}{(n-k)!k!}$ as credited to the "Facebook source" above. See en.wikipedia.org/wiki/Binomial_coefficient also. Oct 16 comment geometry triangles side-side-side | prove my teacher she is wrong? @HagenvonEitzen Absolutely. Without that information, the case for congruence is severely crippled if not eliminated. Granted, I'm still blurry on the details of what is where and the givens from the "image" provided. Oct 10 awarded Teacher Oct 10 awarded Editor Oct 10 revised geometry triangles side-side-side | prove my teacher she is wrong? added 1052 characters in body Oct 10 answered geometry triangles side-side-side | prove my teacher she is wrong?