A bag contains three red marbles and eight blue marbles. Your randomly pick a marbles and then pick a second marble without returning the marbles to the bag. What is the probability that the first marble is red and the second marble is blue?
3 out of 11 are red First marble red : 3/11
now there are 10 marbles left of which 8 are blue Second marble blue : 8/10
3/11* 8/10 = 12/55