Can someone help me with this probability question?

Ok simply put, I'm working on a "calculator" that figures out the probabilities in a playoff system. So far I have calculated the probabilities of each possible match-up. Now I want to use these probabilities to calculate the probability of each team moving on to the next round. Finding the probability of one team moving from the first round to the second is easy as it is just the probability of the one match-up. In particular, I am looking at the NFL playoffs and their 6 teams per conference system. I need to find equations for three particular problems:

1. What is the probability of a 3 seed making it to the conference round?

2. What is the probability of a 4 seed making it to the conference round?

3. What is the probability of a 1 seed making it to the conference round?

Things to keep in mind: the 1 seed has a bye during the wildcard round. The 4 seed has to either play the 1 seed or the 2 seed depending on the matchup of seeds 3 v 6. The 3 seed only has to play the 2 seed if they win their wildcard matchup.