It is exceptionally easy to use and only requires two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators. In addition to higher performance than fixed regulators, the series offerss full overload protection available only in IC's. So there it is. For this resistor we will allow a value of 15K or 15,000 ohms.
Every class has it's dill.
If you don't know the answer then either you took short cuts and didn't do the basics or you just plain forgot. Either way when you do email me about this, I can virtually guarantee I will email myself back to you in return, grab you around the throat and, speak quite severely to you. Worse still, I will send you a .jpg photo of myself and that has been known to terrorise small children, cause little old ladies to faint with fright and for cows' milk to sour. Don't cross me. Other maximum voltages can be accomodated by simply fiddling with value of resistor R2b.