question_answer
Find the value of P, Q, R and S respectively. \[\begin{align} & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,R\,\,S \\ & \,\,\,\,\,\,\,\,\,\,Q\,\,R\,\,S \\ & \underset{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}{\mathop{\underset{1\,\,\,\,\,\,9\,\,\,\,\,8\,\,\,\,\,9}{\mathop{\underset{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}{\mathop{+\,\,\,Q\,\,P\,\,R\,\,S}}\,}}\,}}\, \\ \end{align}\]