In a sample of 2016 U.S. adults, 383 said Franklin Roosevelt was the best president since World War II. Two U.S. adults are selected at random without replacement.
(a) Find the probability that both adults say Franklin Roosevelt was the best president since World War II.
(b) Find the probability that neither adult says Franklin Roosevelt was the best president since World War II.
(c) Find the probability that at least one of the two adults says Franklin Roosevelt was the best president since World War II.
(d) Which of the events can be considered unusual? Explain.