One partly filled case contains two bottles of orange juice, four bottles of cola, and four bottles of beer; another partly filled case contains three bottles of orange juice, seven colas, and two beers. A case is opened at random and a bottle selected at random from it. What is the probability that it contains a nonalcoholic drink? Had all the bottles been in one case, what is the probability that a bottle selected at random from it would contain a nonalcoholic drink?