a. Jean Sherrod of Little Caesar's Enterprises, Inc., explains that an order where the first pizza is pepperoni and the second pizza is ham would be considered different from an order in which the first pizza is ham and the second pizza is pepperoni. Using this scheme, how many pizza orders are possible?

b. If we accept the facts of the advertisement and order one pizza per day, how long will we be able to place different pizza orders before we are forced to order a pizza previously ordered?