A bag contains 4 green marbles, 2 yellow marbles and 5 blue marbles. Three marbles are drawn from the bag, without replacement. Calculate the probability that a) The first marble is green, the second yellow and the third blue. (1 mark) b) The three marbles are of three different colors. (1 mark) c) The three marbles are the same color. (2 marks) d) There is a blue marble drawn following the draw of green marble, but not necessarily imme- diately after. (2 marks)