Hugo plans to buy packs of Pokemon cards until the gets a particular card, but he only has enough money to buy at most 4 packs. Suppose that each pack has a probability of 0.2 of containing the card the Hugo is hoping for. 

Let X be the number of packs of cards Hugo buys. Here is the probability distribution of X:

X = # of packs1234

P(X)0.20.8*0.2 = 0.160.8*0.8*0.2 = 0.128?

What is the P(X = 4)?