What is the difference between permutation and combination?
A permutation counts ordered arrangements (a password); a combination counts unordered selections (a team) — nCr = nPr / r!.
A permutation counts ordered arrangements (a password); a combination counts unordered selections (a team) — nCr = nPr / r!. A reliable way to keep them apart is to focus on what each one is defined by, not just the similar-sounding words.
Key point
permutation vs combination
Tap to watch or see it right here — the app stays open (it only opens a quick search if nothing embeddable is found).