00:02
Okay, in this problem, we're asked to find the number, the different, i'm sorry, the number of different passwords that we can choose if the first two entries are letters and the last three entries are numbers.
00:14
All right, so this is how we're going to do this.
00:15
We're going to use the fundamental counting principle, which means if i have a certain number of choices for this first slot, and then a certain number of choices for the second one, and for the third, and so on, i'm just going to multiply those numbers together in order to find out the total number of choices that i have.
00:32
So the problem says that for the first two entries, i have letters that i'm choosing.
00:38
And that repetition is allowed.
00:39
So that means that with this one, how many letters do i have to choose from for that first entry? well, it's 26 letters.
00:45
Right.
00:46
So i have 26 choices.
00:47
Now, it says that repetition is allowed...