A certain junior class has 100 students and a certain senior class has 80 students. Among these students, there are 6 siblings pairs each consisting of 1 junior and 1 senior. If 1 student is to be selected at random from each class, what is the probability that the 2 students selected will be a sibling pair?  Choose the correct option:
A) 3/40000  B) 1/3600  C) 9/2000  D) 3/4000  E) 1/15
Let's see   Pick 6/100 first   Then we can only pick 1 other pair from the 800   So total will be 6 / 80 *100   Simplify and you get 3/4000   Answer is 3/4000
<result>D</result>
A certain junior class has 100 students and a certain senior class has 80 students. Among these students, there are 6 siblings pairs each consisting of 1 junior and 1 senior. If 1 student is to be selected at random from each class, what is the probability that the 2 students selected will be a sibling pair?