other than that you can write the exact same math and I will say something about the densities instead of the actual probability mass now let's work through the equations we'll be using the most all right so there are essentially two equations there are two equations we'll be using a lot and so let's explicitly step through them and see what they are one s cold law of total probability was it say it says that and we'll write it for the discrete case the probability distribution for X is equal to so probability x equals x is sum over all