1. The problem statement, all variables and given/known data Ignore the wires that go out of the image. 2. Relevant equations 3. The attempt at a solution At first I thought they were in series because they're all lined up. But why can't the 4 kilo-ohm resistor and 12 kilo-ohm resistor be in parallel with the 6 kilo-ohm resistor where A and B are the two nodes? Does it depend on the polarity of the resistors?