Which of the following is a “rule” that you should pay attention to when taking photographs?

Acetylene is a gas which burns rapidly on its own, and is considered highly explosive. a) true b) false

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?

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