In statistics, in order to find the number of possible
arrangements of a set of objects, we use a concept called
permutations. There are methods for calculating permutations,
and it's important to understand the difference between a set
with and without repetition. Other important concepts that can
apply to situations like permutations are the fundamental
counting principal and basic probability. So permutations are a
way of saying different ways to arrange something okay so you
basically have the same elements but by rearranging them you
have a different permutation. First thing I want to do is just
give you an example to visualize this. And what we're looking at
is a number of ways to arrange the letters a, b and c. Okay so
I'm going to start out by just writing them out, so we could
have a, b, c we could just keeping our a first and then switch
our b and our c have a, c, b. There's no other way we could do a
first so no we can go to b first, we could say b, a, c let's
switch those first 2 letters and have