I have a bit of a debate going on in the comments section of an answer, and I'm wondering if someone with a bit more of a mathematics background can chime in. Here's the answer in question:
security.stackexchange.com/a/161509/213456 The debate is surrounding a sentence in the "Interesting note" section at the bottom. It says, "a 1000 possibility combination lock, if guessed randomly, actually has a 1 in 630 chance of getting it correct."