Calculate the wavelength of radiations emitted producing a line in Lyman series,when an electron falls from fourth stationary state in hydrogen atom $(R_H=1.1\times 10^7m^{-1})$

Question

$\begin{array}{1 1}(a)\;1.34\times 10^{-7}m&(b)\;0.9696\times 10^{-7}m\\(c)\;1.34\times 10^{-4}m&(d)\;1.1\times 10^{-2}m\end{array}$