Talk:Terms and Conditions/@comment-209.161.165.98-20180326083127/@comment-27794543-20180330114728

5 digit numeric has a total of 100,000, so yeah the writers were off.

Assuming stranded decimal system (base 10), that's 10 possible choices for each of the five digits, so 10^5 (10x10x10x10x10), which is 100,000 possibilities. For the writers' math to be correct, they'd have to be using a base 40 numbering system – 40^5 is approximately a hundred million.

5! assumes there are only 5 digit choices and each digit can only be used once, neither of which assumptions I recall being stated.