00:03
All right.
00:05
So for this particular problem number five, we are working on digits to choose from.
00:14
We have one, two, three, four, and five available.
00:17
And we're trying to figure out how many possibilities there are without repetition in the first part.
00:23
A, how many possibilities can we arrange a three -digit number without repetition? so you've got to think of the position.
00:32
So in a three -digit number, you have three positions.
00:36
So if i have zero repetitions available, that first number, that lead digit has five options, the one, the two, the three, the four, and the five.
00:48
But then when i move on to my second digit, i no longer can use one of those numbers...