If the binding energy of the electron in a hydrogen atom is 13.6 eV , the energy required to remove the electron from the first exited state of $\;Li^{++}\;$ is :

Question

$(a)\;122.4\;eV\qquad(b)\;30.6\;eV\qquad(c)\;13.6\;eV\qquad(d)\;3.4\;eV$