Isn't the answer infinity?

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

If the potential is of the form AlnBCπε0\frac { A\ln B }{ C\pi { \varepsilon }_{ 0 } } , find A+B+CA+B+C, where AA and CC are co-prime and BB is prime.

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