The equivalent resistance across $AB$ would be ............ $\Omega$
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$30\, \Omega$ and $6\, \Omega$ resistance would be in parallel. It is a balanced wheat stone bridge. $10\, \Omega$ would be removed.
$\boxed{{{\text{R}}_{{\text{eq}}}} = \frac{{9 \times 18}}{{27}} = 6\,\Omega }$
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