So there's three times two times one way to arrange three different things. So three times two times one is equal to six. So the number of possibilities of getting three heads is actually going to be this 5 times 4 times 3. Let me write this down in another color. So the number of possibilities, let's write this for short, is equal to this 5 times 4 times 3 over the number of ways that I can rearrange three things. Because we don't want to over count for all of these. Viewing this arrangement is fundamentally different than this arrangement.