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Five equal resistances each of value $R$ are connected in a form shown alongside. The equivalent resistance of the network
  • ABetween the points $B$ and $D$ is $ R$
  • BBetween the points $B$ and $D$ is $\frac{R}{2}$
  • CBetween the points $A$ and $C$ is $R$
  • DBoth $(b)$ and $(c)$
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