Damon is locked out of his house. the only open window is on the second floor. which is 12 feet above the ground. he needs to borrow a ladder from his neighbor. if he must place the ladder 5 feet from the house to avoid some bushes, what length of ladder does damon need? explain.

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?