Your goal is to have $250,000 in a 401K that is compounded continuously so that someday you can retire. If you invest $6,500 at 8.5%
for forty years, how much money will you have?

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?