00:01
Okay, so we have three digit numbers.
00:03
We're forming three digit numbers again, and we are using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
00:10
Okay, so all of the units digits here.
00:13
So repeated digits are allowed.
00:16
Okay, so this sounds like another fundamental counting principle problem, and we're going to have, it looks like, three digit numbers, so we're going to be picking digits for all three positions here.
00:28
So again, according to fundamental counting principle, if you have a ways to do something and b ways to do another thing, you have a times b ways to do both things.
00:38
And you can apply that to any number of things you were doing.
00:41
So we have three different events in this case.
00:44
We have a, we have b, and then we have c.
00:46
So we're going to find the number of ways to do all three of those and then just multiply them together.
00:52
So for our first event here, our a, we're going to find how many digits we can put in our first spot.
01:00
So we have 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.
01:05
So that looks like 10 different digits we can choose here...