For some one-electron system with $l = 0$ and $m = 0$, the functions $N_o e^{-\sigma}$ and $N_1(2-\sigma)e^{-\sigma}$ refer respectively to the ground ($E_o$) and first excited ($E_1$) energy levels. If a variational wave function $N_2(3-\sigma)e^{-\sigma}$ yields an average energy $\bar{E}$, it will satisfy