Organizations and individuals use social media marketing in various ways. which of the following is not an application of social media marketing?

Idon understand these and need some ! ?

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?

How can you tell if someone sent you a text message to your email instead of a email