find the equivalent resistance between A and B
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well the numbering is not given, but see this
resistance of top-left part = 2R
then resistance of the part adjacent to it = 2R/3
now resistance of the top part = 5R/3
similarly the resistance of the down part will be 5R/3
now, top part, middle part and down part are in parallel combination
Then their equivalent resistance = 1/(5R/3) + R + 1/(5R/3)
= 11/5R
so 11/5R is the equivalent resistance
hope you get the calculation
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