Exercise 2.26. suppose events a, b,c, d are mutually independent. show that events ab and cd are independent. justify each step from the definition of mutual independence.

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?