Find equivalent resistance at terminals a-b and c-d in the given circuit
I can give you a couple of hints. To find the equivalent resistance between a and b you you can neglect the 60-ohm resistor as it's left open. In this case, the 15, (right) 100, and 150 ohm-resistors are all in series, and the result is in parallel with the left 100-ohm resistor, and whole thing comes in series with the 50-ohm resistor. This is for a and b terminals. Repeat the same steps for equivalent resistance between terminals c and d. \end