If $\overline{\mathrm{OA}}=3 \bar{i}+\bar{j}-\bar{k},|\overline{\mathrm{AB}}|=2 \sqrt{6}$ and the direction…
If $\overline{\mathrm{OA}}=3 \bar{i}+\bar{j}-\bar{k},|\overline{\mathrm{AB}}|=2 \sqrt{6}$ and the direction ratios of $\overline{\mathrm{AB}}$ are $1,-1,2$ then $|\overline{\mathrm{OB}}|=$