The moment of inertia $I$ of a rectangular section about its neutral axis is given by the formula $I = \frac{bd^3}{12}$, where $b$ is the breadth and $d$ is the depth of the section. Here, $b = 25$ mm and $d = 150$ mm. So, we have
\[I = \frac{25 \times 150^3}{12}
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