Two gases of equal mass are in thermal equilibrium. If  and ${\mathrm{V}}_{\mathrm{a}}$ and ${\mathrm{V}}_{\mathrm{b}}$ are their respective pressures and volumes, then which relation is true

1.

2.

3. $\frac{{\mathrm{P}}_{\mathrm{a}}}{{\mathrm{V}}_{\mathrm{a}}}=\frac{{\mathrm{P}}_{\mathrm{b}}}{{\mathrm{V}}_{\mathrm{b}}}$

4.

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