# For a binary ideal liquid solution,the total pressure of the solution is given as

$\begin{array}{1 1}p_{total}=p_A^*+(p_A^*-P_B^*)x_B\\p_{total}=p_B^*+(p_A^*-P_B^*)x_A\\p_{total}=p_A^*+(p_B^*-P_A^*)x_A\\p_{total}=p_B^*+(p_B^*-P_A^*)x_B\end{array}$

Answer : $p_{total}=p_B^*+(p_A^*-P_B^*)x_A$
We have
$p_{total}=p_A+p_B=x_AP_A^*+x_BP_B^*+(1-x_A)P_B^*=p_B^*+(p_A^*-P_B^*)x_A$