Find the equivalent Resistance between A and B

Explanation

In this case the circuit has symmetry in the two branches AC and AD at the input `therefore` current in them are same but from input and from exit the circuit is not similar (`because` on left R and on right .2R)
`therefore` on both sides the distribution of current will not be similar .
Here `V_(c)=D_(d)`

hence C and D are same point So , the circuit can be simplified as Now it is balanced wheat stone bridge .

`R_(eq)=(3Rxx(3R)/(2))/(3R+(3R)/(2))=((9)/(2)R)/((9)/(2))=R`