In a sample of 1446 U.S. registered voters, 188 said that Richard Nixon was the worst president since World War II. Three registered voters are selected at random without replacement. 

(a) Find the probability that all three registered voters say that Richard Nixon was the worst president since World War II.

(b) Find the probability that none of the three registered voters say that Richard Nixon was the worst president since World War II.

(c) Find the probability that at most two of the three registered voters say that Richard Nixon was the worst president since World War II.

(d) Which of the events can be considered unusual? Explain.

Use the Multiplication Rule.