Determine the probability of each event, given the following information Express as a reduced fraction. A drawer contains 30 pens of various colors: 4 are black, 10 are blue, 3 are red, 6 are green, 6 are blue and red, and 1 is white. 28. A white pen is removed from the drawer.

29. A pen having blue or red is taken out of the drawer.

30. A green pen is removed from the drawer and replaced before a black pen is removed.

31. A black pen is removed from the drawer and is not replaced before a white pen is taken.