Calculate the shortest and longest wavelength in H spectrum of Lyman series. $R_H = 109678 cm^{-1}$

Question

$(a)\;911.7A^{\large\circ},1215.67A^{\large\circ}\qquad(b)\;9117A^{\large\circ},1215.67A^{\large\circ}\qquad(c)\;91.17A^{\large\circ},121567A^{\large\circ}\qquad(d)\;911.7A^{\large\circ},121.67A^{\large\circ}$