Use the Rules of Probability to Determine the Strength of the Following

Short Answer

Use the rules of probability to determine the strength of the following argument. In other words, given that the premises are true, how likely is the conclusion?
Northern and Southern are in different brackets for the semifinals. Odds are 4 to 7 that Northern will win its semifinal game, and 5-to-3 that Southern will win its semifinal game. So, Northern is certain to be playing Southern in the final game.