A card game has 10 yellow cards, 10 blue cards, 10 red cards, and 5 pink cards. The cards are shuffled and placed face down on the table. What is the probability that the first card she draws will be blue?

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?