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The set of value(s) of a for which the f...

The set of value(s) of `a` for which the function `f(x)=(a x^3)/3+(a+2)x^2+(a-1)x+2` possesses a negative point of inflection is (a) `(-oo,-2)uu(0,oo)` (b) `{-4/5}` (c) `(-2,0)` (d) empty set

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