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user-inactivated  ·  3417 days ago  ·  link  ·    ·  parent  ·  post: Fun and hard little math puzzle

It's not cheating, but I still don't like the double factorial. I had an inkling a lot of the other solutions made use of it, and since it's not something those of us who finished formal math for good by the age of 19 internalized, it's much harder to use in solutions that require intuitive leaps.

Nonetheless, best use of the quiz tag in a long time!!