A certain freshman class has 600 students and a certain sophomore class has 900 students. Among these students, there are 75 two-person sets of lab partners, each consisting of 1 freshman and 1 sophomore. If 1 student is to be selected at random from each class, what is the probability that the 2 students selected will be a set of lab partners?  Choose the correct answer:
A) 1/75 B) 1/96 C) 1/5400 D) 1/7200 E) 1/54000
there are 600*900 two people sets. (total outcomes)   75 sets are 2 people sets and lab partners ( favorable outcomes)   so the probability that the 2   students selected will be a set of lab partners = 75/(600∗900)75/(600∗900)   = 1/7200   Answer: 1/7200
<result>D</result>
A certain freshman class has 600 students and a certain sophomore class has 900 students. Among these students, there are 75 two-person sets of lab partners, each consisting of 1 freshman and 1 sophomore. If 1 student is to be selected at random from each class, what is the probability that the 2 students selected will be a set of lab partners?