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Homework Statement
Calculate the resistance across AO and BO

.......................  .................. 
.....................  .................. 
......................  x ................  x 
......................  x ................  x 
V.....................  ............... 
........................  A.................. B
.............................................
..........................................
 .....................  x ................  x 
......................  x ................. x 
 ................... ................... 
.......................  ..................... 


O
Homework Equations
V=IR
R=R1+R2 in series
R=1/((1/R1)+(1/R2))
All Resistors are 100 ohms
The Attempt at a Solution
I know that if one of the branches wern't there that it is a simple case of a paralell circuit and so the resistance is 1/R = 1/100 +1/100 = 1/50 therefore R across AO would e 50 ohms however I dont know what to do when the second branch is to be included.
Also sorry about the diagram i wasn't sure how to draw it the spaces just dissapeared, the . indicate free space and the x's show the positions of the resistors