So this is not a valid probability model. In order for it to be valid, they would all, all the various scenarios need to add up exactly to 100%. In this case, we only add up to 80%. If we added up to 1.1 or 110%, then we would also have a problem, but we can just write no. Let's do another example. So here, we are told, you are a space alien. You visit planet Earth and abduct 97 chickens, 47 cows, and 77 humans.