The wavelength of $\beta$ line of the Balmer Series is $4815 A^{\large\circ}$. What is the wavelength of $\alpha$ line of balmer Series of the same atom?

Question

$(a)\;4500A^{\large\circ}\qquad(b)\;5600A^{\large\circ}\qquad(c)\;2600A^{\large\circ}\qquad(d)\;6500A^{\large\circ}$