differentiation

Question: If $f(x)=2{{x}^{3}}-21{{x}^{2}}+36x-30$ , then which one of the following is correct



1) $f(x)$ has minimum at $x=1$
2) $f(x)$ has maximum at $x=6$
3) $f(x)$ has maximum at $x=1$
4) $f(x)$ has no maxima or minima
Solution: Explanation: No Explanation
Maxima and Minima

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