Thirteen resistances each of resistance $R\, ohm$ are connected in the circuit as shown in the figure below. The effective resistance between $A$ and $B$ is
  • A$2R\,  \Omega$
  • B$\frac{{4R}}{3}\,\,\Omega $
  • C$\frac{{2\,R}}{3}\,\,\Omega $
  • D$R \, \Omega$
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