There are two samples of H and He^+ atom...

There are two samples of `H` and `He^+` atom. Both are in some excited state. In hydrogen atom, total number of lines observed in Balmer series is `4` in `He^+` atom total number of lines observed in Paschen series is `1`. Electron in hydrogen sample make transitions to lower states from its excited state, then the photon corresponding to the line of maximum energy line Balmer series of `H` sample is used to further excite the already excited `He^+` sample. The maximum excitation level of `He^+` sample will be :

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