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

What transition in the hydrogen spectrum would have the samewavelength

1.	What transition in the hydrogen spectrum would have the samewavelength as the Balmer transition n = 4 to n = 2 of He^(+)spectrum?
Answer» ANSWER :`n_1and n_2= 2 `