Adaily newspaper had 12,125 subscribers when it began publication. five years
later it had 10,100 subscribers. what is the average yearly rate of change in the number
of subscribers for the five-year period?

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?