Pls help it’s on a test!! no links :) you can zoom in if hard to read

An excel which cell contains =b2 is copied to row below, the same column. what will be the new cell's content

Assume that there is a 4% 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 three independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?

The qwerty keyboard is the most common layout of keys on a keyboard