In the given circuit all resistances are of value $R\,ohm$ each. The equivalent resistance between $A$ and $B$ is
JEE MAIN 2018, Diffcult
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${\mathrm{R}_{\text {scries }}=\mathrm{R}_{1}+\mathrm{R}_{2}+\ldots \ldots+\mathrm{R}_{\mathrm{n}}} $
${\frac{1}{\mathrm{R}_{\mathrm{parallel}}}=\frac{1}{\mathrm{R}_{1}}+\frac{1}{\mathrm{R}_{2}}+\ldots \ldots+\frac{1}{\mathrm{R}_{\mathrm{n}}}}$
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