Conditional probability is the likelihood of an event occurring based on the occurrence of an earlier event. The second event is dependent on the first event.

First, represent the information on a tree diagram: From the tree diagram, the probability of winning the second set = 27 50 + 10 50 = 37 50.

First, represent the information on a tree diagram: From the tree diagram, the probability of winning the second set = 27 50 + 10 50 = 37 50.