Two gases of molecular masses $M_A\: and \: M_B$ are at temperatures $T_A\: and \:T_B$ respectively. If $T_AM_B=T_BM_A$ , which one of the following properties has the same value for both the gases?

Question

$\begin {array} {1 1} (1)\;Pressure & \quad (2)\;kinetic\: energy \\ (3)\;RMS \: velocity & \quad (4)\;Density \end {array}$