Probability

The Question is:
In the game of bridge, each of 4 players is dealt 13 cards. If a certain player has no aces, find the probability that that person's partner has:
                                                                    a.)no aces  
                                                                    b.)at least 2 aces

Now, we have done problems like this in class with 2 players and that was really complicated because we had to do combinations and such and I really do not know how to set up this problem when there are 4 players.