Infinite resistors circuit

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!

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