If the potential difference between B and D is zero the value of X is$\frac{1}{\mathrm{n}}\mathrm{\Omega }$ . The value of $\mathrm{n}$ is……

$\text{ For P.d. between B and zero, }$

$\frac{6\text{ Parellel }3}{x\text{ Parellel }1}=\frac{1\text{ series }2}{x}\Rightarrow \frac{6\times 3(x+1)}{(6+3)x}=\frac{3}{x}$

$\begin{array}{l}\frac{2(x+1)}{x}=\frac{3}{x}\\ 2x+2=3\\ x=\frac{1}{2}\end{array}$