A charge +q is fixed at each of the points $\mathrm{x}={\mathrm{x}}_0\mathrm{x}=3{\mathrm{x}}_0,\mathrm{x}=5{\mathrm{x}}_0\dots \dots \mathrm{\infty }$ on the x - axis and a charge-q is fixed at each of the points $\mathrm{x}=2{\mathrm{x}}_0,\mathrm{x}=4{\mathrm{x}}_0,\mathrm{x}=6{\mathrm{x}}_0\dots \dots \mathrm{\infty }$. Here x₀ is a positive constant. Take the electric potential at a point due to a charge Q at a distance r from it to be $\frac{\mathrm{Q}}{4\mathrm{\pi }{\in }_0\mathrm{r}}$. Then the potential at the origin due to the above system of charges is