Ignatz repeatedly rolls a fair $6$-sided die. what is the probability that he rolls his first $5$ before he rolls his second (not necessarily distinct) even number?

Due to a packaging error, 4 cans labeled diet soda were accidentally filled with regular soda and placed in a 12 pack carton of diet soda. two cans were randomly selected from this 12 pack. what is the probability that both cans were regular soda?