A young man has a little black book that contains the names and phone numbers of girls who are potential dates. Suppose that he has the names of 3 redheads, 18 brunettes, and 6 blondes in his book, and that the book has a total of 30 pages. He decides to select one page at random from the book in order to determine whom he will call for a date on a particular night, and each name appears on a separate page.

(a) What is the probability that he will call a blonde ? a redhead ? a brunette?

(Here, count a blank page as “no call.”)

(b) What is the probability that he will sample a page containing the name either of a redhead or a brunette? What is the probability that the page will not contain the name of a blonde ?