> First, where do I find the most popular one million 12-character passwords that use A-Z/a-z/0-9?
I'm sure it may not be easy to find this database, but it is probably not that difficult if you hang out in the type of circles that the people who cracked that site hang out in.
> Math...
This strikes me as nitpicking when one can access such powerful computing devices as to make the difference practically irrelevant. So make it 10million and wait a few more minutes, who cares?