1. The problem statement, all variables and given/known data Calculate the equivalent resistance of the resistor chain shown in the figure between the points a) A and B; b) A and C the resistor chain is infinite in both directions and each resistor has a resistance of R. 2. Relevant equations 3. The attempt at a solution I have solved the b) part. It is the part a) which I face trouble with. How do I approach this? Any help is appreciated. Thanks!