${\mathrm{x}}_1,{\mathrm{x}}_2$ are the roots of the equation ${\mathrm{x}}^2-3\mathrm{x}+\mathrm{A}=0,{\mathrm{x}}_3\text{ and }{\mathrm{x}}_4$ are the roots of the equation ${\mathrm{x}}^2-12\mathrm{x}+\mathrm{B}=0$. If  ${\mathrm{x}}_1,{\mathrm{x}}_2,{\mathrm{x}}_3,{\mathrm{x}}_4$ are in increasing G.P. then