4 ms·

And I'm reminded I suck at math.

• Jun8 15y ago
  The math level of Ron Maimon's answer is a at college undergraduate level at best, it's just a case of patiently enumerating a lot of different cases. In fact I think this is more of a CS question than a math one. It would be interesting to ask a similar question, limiting it to four operations, to a good interview candidate to see how they handle expression parsing and case analysis. Tangentially, Ron's answers on Physics Exchange are consistently among the best, I think he has the highest reputation there.
  • pavel_lishin 15y ago
    What do the ellipses (...) signify in his answer? Does it just mean an arbitrary number of factorials, so long as it's the same for each number?
    • redthrowaway 15y ago
      I read it as, "an arbitrary number of factorials that can be different for each number."
    • nialo 15y ago
      They just indicate some arbitrary number of factorials, with no particular restrictions.