Three equal resistances each of value $R$ are joined as shown in the figure. The equivalent resistance between $M$ and $N$ is
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Three resistances are in parallel.
$\frac{1}{{R'}} = \frac{1}{R} + \frac{1}{R} + \frac{1}{R} = \frac{3}{R}$
The equivalent resistance $R' = \frac{R}{3}\,\Omega $
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