Al and Laura have been taking the 2-course sequence in computer science. A quiz has been provide every week in both courses. Al has received a B or better 80% of time, while Laura has received B or better 90% of the time. Supposing that this trend continues and that the scores of these two students are independent, Determine the probability that
a) both get a B or better on the next quiz?
b) at least one gets a B or better on the next quiz?
c) neither gets a B or better on the next quiz?