Sociology: Ethics The one-time fl ing! Have you ever purchased an article of clothing (dress, sports jacket, etc.), worn the item once to a party, and then returned the purchase? This is called a one-time fl ing. About 10% of all adults deliberately do a one-time fl ing and feel no guilt about it (Source: Are You Normal?, by Bernice Kanner, St. Martin’s Press). In a group of seven adult friends, what is the probability that

(a) no one has done a one-time fl ing?

(b) at least one person has done a one-time fl ing?

(c) no more than two people have done a one-time fl ing?