Infinitely More • 17 implied HN points • 17 Nov 24
- A permutation is just a way to rearrange a list of objects. For example, with three letters like 'a', 'b', and 'c', you can arrange them in six different ways.
- The factorial of a number shows how many ways you can arrange that many objects. For example, 5! equals 120 because it's 5 times 4 times 3 times 2 times 1.
- When choosing items from a group without caring about the order, we use combinations. The formula for this is called 'n choose k', which helps calculate how many ways you can select items.