Work done by a force $\overrightarrow{\mathrm{F}}=\left(\hat{\mathrm{i}}+2\hat{\mathrm{j}}+3\hat{\mathrm{k}}\right)$ acting on a particle in displacing it from the point $\overrightarrow{{\mathrm{r}}_1}=\left(\hat{\mathrm{i}}+\hat{\mathrm{j}}+\hat{\mathrm{k}}\right)$ to the point $\overrightarrow{{\mathrm{r}}_2}=\left(\hat{\mathrm{i}}-\hat{\mathrm{j}}+2\hat{\mathrm{k}}\right)$ is: