[Tutor] Creating lists with definite (n) items without repetitions

Peter Otten __peter__ at web.de
Sat Sep 5 11:27:02 CEST 2015


Peter Otten wrote:

[proofreading goof]

> OK, you want all triples where no pair inside a triple is repeated.
> There are 325 pairs, and one triple uses up three pairs.
> That puts an upper limit of 325/3 = 108 on the number of triples.
> You then have to find all sets of 

three

> pairs where the union contains

... three letters.
 




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