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The integrating factor of the differential equation $\large\frac{dy}{dx}$$+py=Q$ is

\[\begin{array}{1 1}(1)\int\mathrm{pdx}\,&(2)\int\mathrm{Q}\,\mathrm{dx}\\(3)\int\limits_{e}\mathrm{Q}\,\mathrm{dx}&(4)\int\limits_{e}\mathrm{p}\mathrm{dx}\end{array}\]

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Integrating factor of the differetial equatio $\large\frac{dy}{dx} $$+Py =Q $ is $e^{\int pdx}$
Hence 4 is the correct answer.
answered May 21, 2014 by meena.p

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