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A solution of the following differential equation is given by
$\frac{d^{2} y}{d x^{2}}-5 \frac{d y}{d x}+6 y=0$

1. $y=e^{2 x}+e^{-3 x}$
2. $y=e^{2 x}+e^{3 x}$
3. $y=e^{-2 x}+e^{3 x}$
4. $y=e^{-2 x}+e^{-3 x}$