Deena wrote the situation "i bought some shirts at the store for $9 each and received a $25 discount. my total bill was $88. how many shirts did i buy? "

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?