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If `f(x)=2x^(3)-21x^(2)+36x-20`, then

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If `f(x)=2x^(3)-21x^(2)+36x-20`, then
A. f has maxima at x=6
B. f has minima at x=1
C. f has maximum value -3
D. f has minimum value -3
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Correct Answer - C
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