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Solution

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Since, the focus lies on the $y$-axis and directrix $y=3$ is above the $x$-axis.

So, the axis of the parabola is $y$-axis.

Therefore, the equation of the parabola is either of the form $x_{2}=−4ay$

Here $a=3$

Thus, the equation of the parabola is $x_{2}=−12y$

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