66. Through the week ending September 16, 2001, Tiger Woods was the leading money winner on the PGA Tour, with total earnings of $5,517,777. Of the top 10 money winners, seven players used a Titleist brand golf ball (http://www.pgatour.com). Suppose that we randomly select two of the top 10 money winners.

a. What is the probability that exactly one uses a Titleist golf ball?

b. What is the probability that both use Titleist golf balls?

c. What is the probability that neither uses a Titleist golf ball?