1. The problem statement, all variables and given/known data Image: http://puu.sh/1ejYb [Broken] Spoiler http://puu.sh/1ejYb [Broken] 2. Relevant equations Req of n resistors in series = R1 + R2 + ... + Rn Req of n resistors in parallel = 1/R1 + 1/R2 + ... + 1/Rn 3. The attempt at a solution The answer is supposed to be 10 ohms. However, I don't know how they got that. What I was thinking that some of the resistors short circuit and the current does not pass through them. So, it would be like: 3 ohms, then 6 ohms and finally 5 ohms. However, that adds up to 14 ohms and also I'm very sure that's wrong. Thanks a lot!