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?

`P_(a) != P_(b) , V_(a) = V_(b)`

`P_(a) = P_(b) , V_(a) != V_(b)`

`(P_a)/(V_a) = (P_b)/(V_b)`

`P_(a)V_(a) = P_(b)V_(b)`

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