1. The problem statement, all variables and given/known data A soft-drink machine dispenses only regular Coke and Diet Coke. 60 percent of all purchases from this machine are diet drinks. The machine currently has 10 cans of each type. If 15 customers want to purchase drinks prior to the machine being restocked, what is the prob that each of the 15 is able to purchase the type of drink desired? 2. Relevant equations Binomial distribution 3. The attempt at a solution I think it's a binomial distribution. So - 20C15*(0.6)^15*(0.4)^5? But it doesnt seem right. Any ideas? Thanks.