Suppose there is a vending machine that sells CokeTM and SpriteTM. This particular vending machine has 3 dispensers, one for CokeTM, one for SpriteTM, and one that dispenses either a CokeTM or a SpriteTM at random. There's just 1 problem, all of the labels for the dispensers have been mixed up and are incorrect! How many times do you have to buy a drink in order to know definitively which dispenser dispenses what? (Note: Each dispenser has a unique incorrect label from SpriteTM, CokeTM, Random)