OMG !! Is the diagram correct ???
1) Remove red wire and take two ends (previouslyconnected by of red wire) to the centre.
2) Replace all four R , R parrallel combinations of resistances thus formed bu res. R/2
3) Two triangles are formed now....Upper triangle is an hanging resistance, detach it.
4) Lower triangle has Resistance R/2 across A,B.
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