Hi, I need help simplifying this circuit with parallel and series resistors. I am mainly confused, because there seems to be a point in my simplification where in picture 4 and 5 of my second image where the remaining 3 resistors are connected by 1 node. I tried to simplify them as resistors in parallel, but I end up with the wrong answer, and this doesn't seem like the correct thing to do. 1. The problem statement, all variables and given/known data The Resistor equivalent of the entire circuit is 9 ohms. And the answer for 'R' is 15 ohms. However I do not know how to obtain this answer. 2. Relevant equations Series Resistors = R1 + R2 = Rtotal Parallel = R2*R1/R1+R2 = Rtotal = 1/R3 + 1/R2 + 1/R1 = Rtotal 3. The attempt at a solution Here are the images of my attempted solutions: image 1 (the problem): http://img22.imageshack.us/img22/9206/resistor1.jpg [Broken] image 2 (my analysis): http://img22.imageshack.us/img22/4978/resistor2.jpg [Broken] Any help would be appreciated.