A math class consists of 21 female students and 18 male students. Two students are selected at random to participate in a probability experiment. Compute the following probabilities. Write your answers in decimal form. Round to the nearest thousandth as needed.

a. A male is selected, then a female:_______

b. A female is selected, then a male:_______

c. Two males are selected:_____

d. Two females are selected:_____

e. No males are selected:_____