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  • 10^9 is billion, not trillion -- in US; in UK 10^9 is thousand million and 10^12 is billion. Commented Jan 20, 2018 at 8:12
  • @dave_thompson_085 the long scale hasn't been used officially since 1974: en.wikipedia.org/wiki/Billion Commented Jun 29, 2018 at 19:07
  • @anthonyrisinger - it's my bad. What dave is saying is that (94^8) / (2^21.6) has 9 digits instead of 12 (which is what my post was implying.) Am fixing. Commented Jun 29, 2018 at 20:19
  • "The average password entropy is 21.6." What's the average passphrase entropy, over a similar sample? Commented Aug 3, 2018 at 15:40