Equal molecules of two gases are in ther...

Equal molecules of two gases are in thermal equilibrium. If `P_(a), P_(b) and V_(a),V_(b)` are their respective pressures and volumes, then which of the following relation is true?

`2P_aV_a` = `P_a V_b`

`P_a ne P_b,V_a=V_b`

`P_a//V_a=P_b//V_b`

`P_a V_a = P_bV_b`

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