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What is the interval of f(x) = (x – 1)(x – 2)(x – 3)/(x3 + 6x2 + 11x + 6) where f(x) is positive?

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What is the interval of f(x) = (x – 1)(x – 2)(x – 3)/(x<sup>3</sup> + 6x<sup>2</sup> + 11x + 6) where f(x) is positive?






 
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