00:01
So the first thing to think about is this a combination or a permutation.
00:04
Remember, in a combination, order does not matter.
00:11
So what this indicates is that selecting events a, b, and c is the same as selecting events b, a, and c.
00:17
Whereas a permutation, order does matter.
00:22
So then selecting events a, b, and c is different than the order b, a, and c.
00:27
Okay, so i want to know how many different signals can be made using at least.
00:32
Three different flags.
00:35
Okay.
00:36
So does the order matter here? well, i'm trying to find signals, so then the different flags will matter.
00:44
So this is a permutation.
00:45
So let's say there's three different flags.
00:50
This will be five permutate three, which will be the same as 5 factorial over five minus three, which is 2 factorial...
