Suggest two transitions in hydrogen spectrum for which the number ratio is 108:7

Which transition in hydrogen spectrum the maxima frequency

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n=4 to n=2 of He^(+) spectrum ?

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n=4 to n=2 of He^(+) spectrum?

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition, n = 4 to n = 2 of He+ spectrum?

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n=4 to n=2 of He^(+) spectrum ?