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# Two miscible liquids A and B having vapour pressure in pure state and are mixed in mole fraction $X_A$ and $X_B$ to get a mixture having total vapour pressure of mixture $P_M$. Which of the following relations are correct?

$X_A=\large\frac{P_M-P_B^0}{P_A^0-P_B^0}$,$\large\frac{X_A}{X'_A}=\frac{P_M}{P_A^0}$