Final answer:
Florian uses episodic memory to remember his locker combination because it is associated with his favorite singer's birth date, a personal experience.
Step-by-step explanation:
Florian now easily remembers his locker combination because it matches his favorite singer's birth date, indicating that he uses episodic memory. Episodic memory is a type of declarative memory that contains information about events we have personally experienced. By associating his locker combination with his favorite singer's birth date, Florian is using a personal experience or episode to recall this information. Therefore, when Florian realized that the numbers matched his favorite singer's birth date, he was able to recall his locker combination with the aid of episodic memory, which is concerned with the personal experiences that we can consciously remember and recall.