Suppose that in your city 37% of the voters are registered as Democrats, 29% as Republicans, and

Question:

Suppose that in your city 37% of the voters are registered as Democrats, 29% as Republicans, and 11 % as members of other parties (Liberal, Right to Life, Green, etc.). Voters not aligned with any official party are termed "Independent." You are conducting a poll by calling registered voters at random. In your first three calls, what is the probability you talk to
a) All Republicans?
b) No Democrats?
c) At least one Independent?