There are 12 freshmen and 17 sophomore students in a classroom. We randomly select two students. Suppose the students were selected with replacement. a) If the first student was a freshman, what is the probability that the 2nd student is also a freshman? b) If the first student was a sophomore, what is the probability that the 2nd student was a freshman? Suppose the students were selected without replacement. c) If the first student was a freshman, what is the probability that the 2nd student is also a freshman? d) If the first student was a sophomore, what is the probability that the 2nd student was a freshman