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If `f(x)=2x^3+9x^2+lambdax+20` is a decreasing function fo x in the largest possible interval (-2,-1) then `lambda` =

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If `f(x)=2x^3+9x^2+lambdax+20` is a decreasing function fo x in the largest possible interval (-2,-1) then `lambda` =
A. 12
B. -12
C. 6
D. none of these
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Correct Answer - A
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