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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