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In the network shown in the following figure, each resistance is $1\,ohm.$ The effective resistance between $A$ and $B$ is
  • A$\frac {4}{3}\,\Omega $
  • B$\frac {3}{2}\,\Omega $
  • C$7\,\Omega $
  • D$\frac {8}{7}\,\Omega $
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