পৃথিবীর ভর: M =?

$\frac{\mathrm{gR}^{2}}{\mathrm{G}}$

$\frac{\mathrm{gR}}{\mathrm{G}}$

$\frac{\mathrm{GR}^{2}}{\mathrm{~g}}$

$\frac{\mathrm{R}^{2}}{\mathrm{~g}}$