Hi I am little confused by star resistors configuration. The problem is asking for equivalent resistor for the circuit. I have attached the image below (Image is little sloppy because I can't draw with a mouse :D). My logic is as follows: First I calculated R1 and R2 as parallel resistors. Req1 = (1/R2 + 1/R1)^-1 Req1 = 11.25; Then I calculated that value in series with 4.5 resistor. Req2 = 11.25 + 4.5 = 15.75; Since, Req2 is parrallel with R4 then they should also add reciprocally. Rt = (1/R4 + 1/Req2)^-1 = 6.81; This value is wrong though I don't know what I did wrong. Thanks for help in advance.