Of the 15 teams in the National Hockey League Eastern Conference, three of them are based in canadian cities. Each year, eight of these teams qualify for the playoffs. Assuming that all the 15 teams have an equal chance of getting into the playoffs, what is the probability that

Question

Of the 15 teams in the National Hockey League Eastern Conference, three of them are based in canadian cities. Each year, eight of these teams qualify for the playoffs. Assuming that all the 15 teams have an equal chance of getting into the playoffs, what is the probability that
a) none of the canadian teams make the playoffs
b) at least one of the canadian teams makes the playoffs
c) all three canadian teams make the playoffs.

**if i even get hints or help with one part i am sure i can figure it out. thanks.