A function $\mathrm{f}\left(\mathrm{x}\right)$  is given by  $\mathrm{f} \left(\mathrm{x}\right)=\frac{5^{\mathrm{x}}}{5^{\mathrm{x}}+5}$ then the sum of the series $\mathrm{f} \left(\frac{1}{20}\right)+\mathrm{f} \left(\frac{2}{20}\right)+\mathrm{f} \left(\frac{3}{20}\right)+........+\mathrm{f} \left(\frac{39}{20}\right)$ is equal to :