The one-time fling! Have you ever purchased an article of clothing (dress, sports jacket, etc.), worn the itemonceto a party, and then returned the purchase? This is called aone-time fling. About15%of all adults deliberately have done a one-time fling and feel no guilt about it! In a group ofsevenadult friends, what is the probability of the following? (Round your answers to three decimal places.)

(a) no one has done a one-time fling (b) at least one person has done a one-time fling (c) no more than two people have done a one-time fling