Equivalent Resistance Between Terminals

[chunkytuna21]

What is the equivalent resistance of the circuit in Fig. P29 between terminals A and B? R1 = 5 , R2 = 5 , R3 = 5 and R4 = 1 . Note that the wires cross but do not make contact at the center.

V= IRe
IRe= IR1 +IR2
Series= Re= R1+R2
Parallel= 1/Re= 1/R1+R2
Re= R1R2/R1+R2

I am assuming all 4 resistors are parallel, right? So, I just plugged the values into the equation: 1/5+1/5+1/5+1/1= 1.6; 1/1.6= 0.625
This isn't the answer though. Where am I going wrong? I know they are not in series because I tried that already. Any help is greatly appreciated.

 

[gamer_x_]

post picture as a link, we still can't see the attachment. What I do in these cases is redraw the circuit to actually show group the series and parallel resistors, that way it's easier to see where you can simplify.