00:02
Okay, we have 21 total flavors and we want to choose three scoops of ice cream and we want each scoop to be a different flavor.
00:12
So the first scoop we choose, we have 21 options.
00:17
We could choose any flavor.
00:19
But once we choose that, it's no longer an option because we want each one to be different.
00:24
So now we only have 20 options.
00:28
And now once we've done two, now we have 19 options.
00:33
So we multiply all of those together, 21 times 20 times 19.
00:42
And we get 7 ,980 different ways that we could select three scoops of ice cream.
00:52
Next, we want to do four different toppings, and there's 10 of them.
00:58
So we're going to do the same thing...