Question:
Mark $(\sqrt{)}$ against the correct answer in the following:
$f(\mathrm{x})=[\mathrm{x}(\mathrm{x}-3)]^{2}$ is increasing in
A. $(0, \infty)$
B. $(-\infty, 0)$
C. $(1,3)$
D. $\left(0, \frac{3}{2}\right) \cup(3, \infty)$
Solution:
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