1. The problem statement, all variables and given/known data http://i50.tinypic.com/w0ggl.png 2. Relevant equations 3. The attempt at a solution I am stuck at part (a) (i haven't yet tried the part (b)). I really have no clue on how should i go on finding the equivalent resistance, i don't see a way to reduce it to simpler parallel and series combinations. Any help is appreciated.