1/Rt = 1/R1 + 1/R2 + ...
The Attempt at a Solution
I can do part (i) okay. It is simply 1/12 + 1/12 = 1/6, so R = 6. But I have been trying for ages to figure out part (ii). I tried re-drawing the circuit in different forms but it didn't help me.
The one that makes most sense to me is 1/12 + 1/12 + 1/6 which gives the total resistance as 3, but the correct answer is 3.75, and I seriously can't figure out why no matter how hard I try.