A car begins at point A. During its trip, the car moves in a straight line until it reaches a point that is 3 miles south and 4 miles east relative to point A. The car then immediately moves to its
final destination which is 2 miles south and 4 miles east relative to point C. The entire trip takes 19
minutes.

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?