The effective resistance of two resistors in parallel is $\frac{{12}}{7}\,\Omega $. If one of the resistors is disconnected the resistance becomes $4$ $\Omega$. The resistance of the other resistor is.............. $\Omega$
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(b) $\frac{7}{{12}} = \frac{1}{4} + \frac{1}{R}\, \Rightarrow \,\,R = 3\,\Omega $
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