Three resistances, each of $1\, ohm$, are joined in parallel. Three such combinations are put in series, then the resultant resistance will be ............. $ohm$
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$\frac{1}{R} = \frac{1}{1} + \frac{1}{1} + \frac{1}{1} = \frac{3}{1}$ $ \Rightarrow $ $R = \frac{1}{3}\,ohm$
Now such three resistance are joined in series,
hence total $R = \frac{1}{3} + \frac{1}{3} + \frac{1}{3} = 1\,ohm$
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