Actually, if you're doing a real problem with a bunch of resistors. What you would do is look for the "few" smallest resistors and compute their resistance. In other words, if you have 10 roughly equal resistors then the total resistance is about 1/10. If you have 3 small and 7 large, you can guess it is between 1/3 to 1/10, but if the 3 smalls are really small then it should be around 1/3 + delta. You should develop a sense of value when you see a resistance network. Guestimate is your friend :)

More than 2 resistors in parallel
In Iran there is another way to do the mandatory military service and it is working for a governmental organization or company instead. It is simply called 'امریه' in Persian. Is it called CPS (Civilian Public Service)? Civilian Military Service? what exactly?
