A charge $+16$ C is fixed at each of the points $x=3, 9, 15, \ldots, \infty$ on the $x$-axis, and a charge $-16$ C is fixed at each of the points $x=6, 12, 18, \ldots, \infty$ on the $x$-axis. Then find the potential at the origin due to these charges.

If the potential is of the form $\frac { A\ln B }{ C\pi { \varepsilon }_{ 0 } }$, find $A+B+C$, where $A$ and $C$ are co-prime and $B$ is prime.

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