Structure of Atom

For the Balmer series in the spectrum of H atom, $$\overline \nu = {R_H}\left\{ {{1 \over {n_1^2}} - {1 \over {n_2^2}}} \right\}$$, the correct statements among (I) to (IV) are : (I) As wavelength decreases, the lines in the series converge (II) The integer n₁ is equal to 2 (III) The lines of longest wavelength corresponds to n₂ = 3 (IV) The ionization energy of hydrogen can be calculated from wave number of these lines