It is known that diskettes produced by a certain company will be defective with probability .01, independently of one another. the company sells the diskettes in packages of size 10 and offers a money-back guarantee that at most 1 of the 10 diskettes in the package will be defective. the guarantee is that the customer can return the entire package of diskettes if he or she finds more than 1 defective diskette in it. if someone buys 3 packages, what is the probability that he or she will return exactly 1 of them?