The integrating factor of the differential equation $\large\frac{dy}{dx}$$+py=Q is $\begin{array}{1 1}(1)\int\mathrm{pdx}\,&(2)\int\mathrm{Q}\,\mathrm{dx}\\(3)\int\limits_{e}\mathrm{Q}\,\mathrm{dx}&(4)\int\limits_{e}\mathrm{p}\mathrm{dx}\end{array}$ 1 Answer Integrating factor of the differetial equatio \large\frac{dy}{dx}$$+Py =Q$ is $e^{\int pdx}$
Hence 4 is the correct answer.