It is known that disks produced by a certain company will be defective with probability .01 independently

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It is known that disks produced by a certain company will be defective with probability .01 independently of each other. The company sells the disks in packages of 10 and offers a money-back guarantee that at most 1 of the 10 disks is defective.

What proportion of packages is returned? If someone buys three packages, what is the probability that exactly one of them will be returned?

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