Bohr theory: Find series wavelength limits

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Question: Use the Bohr theory to find the series wavelength limits of the Lyman and Paschen series of hydrogen.

Answers: 91.13 nm (Lyman)
820.1 nm (Paschen)

I'm thinking that I need to use the formula below, but I don't really understand why nfinal and ninitial are specific to certain series and how you have any idea what nfinal is for a certain series.

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Solution Summary

The solution presents clear formulas used in solving the problem.