1. The problem statement, all variables and given/known data R = 10 Ohms 2. Relevant equations Req = (1/R1 + 1/R2 + ... )(-1) Req = R1 + R2 + ... 3. The attempt at a solution I honestly don't even know where to start... The obvious thing to do is 4R + 2R = 6R That's pretty much all I can come up with that makes sense... Any help?