Each person in Room A is a student, and 1/6 of the students in Room A are seniors. Each person in Room B is a student, and 5/7 of the students in Room B are seniors. If 1 student is chosen at random from Room A and 1 student is chosen at random from Room B, what is the probability that exactly 1 of the students chosen is a senior?	Choose the correct choice from the following
A) 5/42
B) 37/84
C) 9/14
D) 16/21
E) 37/42
Probability of choosing senior from Room A=1/6, Non senior=5/6   Probability of choosing senior from Room B=5/7, Non senior=2/7   Reqd probability= (1/6*2/7)+(5/7*5/6)=27/42=9/14   Answer 9/14
<result>C</result>
Each person in Room A is a student, and 1/6 of the students in Room A are seniors. Each person in Room B is a student, and 5/7 of the students in Room B are seniors. If 1 student is chosen at random from Room A and 1 student is chosen at random from Room B, what is the probability that exactly 1 of the students chosen is a senior?