outcomes Omega is essentially everything that could possibly happen the probability of everything that could possibly happen something in that said to have happened should be 1 otherwise that's not the proper Omega that captures everything and that also means nothing can have a number sign higher than 1 the probabilities don't go above 1 and then probability of the empty set well the empty set is never containing the outcome that happened whatever happened is something it's not in the empty set and so probability of that is