60% of all students at a college still need to take another math class. If 42 students are randomly selected, find the probability that a. Exactly 27 of them need to take another math class. b. At most 25 of them need to take another math class. c. At least 24 of them need to take another math class. d. Between 20 and 25 (including 20 and 25) of them need to take another math class