To cook the black pearts of your favorite milk tea, you need to boil water in a pot which has a diameter of 12 inches and a height of 15 inches. How many liters of water is needed to full in the pot?

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?