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$R \, \Omega$
Diffcult
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C$\frac{{2\,R}}{3}\,\,\Omega $
c (c) Hence ${R_{eq}} = \frac{{2R}}{3}$.
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