Used in math to describe all possible orders of a set, important for probability and statistics. By calculating the permutations, we determine all possible outcomes.
Pro Tip 2/3
Fixed Order
Unlike combinations, every permutation has a unique sequence that matters a lot. Changing the permutation of a lock's code can prevent it from opening.
Pro Tip 3/3
Not Interchangeable
Sequence is key; swapping elements changes the permutation, producing a different arrangement. In a race, permutations of finishers determine the exact rankings.