A local animal shelter has 15 cats, 9 dogs, and 1 hamster. Two of the animals will be featured on a local TV newscast. Each animal's name is written on a slip of paper which is placed in a hat. Two names are randomly selected, without replacement. What is the probability that the two selected animals are cats?

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?