Find the equivalent resistance across terminals a and c. I don't know how the current flows in this circuit so I can't find the equivalent resistance.
Answer
What if you rearranged the elements like this?
simulate this circuit – Schematic created using CircuitLab
Then it's pretty simple to see the equivalent resistance is 6R/3 + R = 3R
Step one if you're stuck on a problem like this is to redraw it.
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