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Also, no resistor is going to be accurate enough to let you get an exact value. Most resistors have either gold or silver bands indicating either 5 or 10% error, respectively. Thus, a 50k ohm resistor could be anywhere between 45k (approx value 115) and 55k (approx value 140). Or maybe it's the other way around...
In any event, don't count on being able to get +/- 1 for accuracy.
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