First a is chosen at random from set {1,2,3,...,99,100}, and then b is chosen at random from the same set. What is the probability that the integer 3^a+7^b has units digit 8?
First a is chosen at random from set {1,2,3,...,99,100}, and then b is chosen at random from the same set. What is the probability that the integer 3^a+7^b has units digit 8?
+40 
