If the roots of the equation x^3 - ax^2 + bx | vedclass

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(D) Let $\alpha, \beta, \gamma$ be the roots of the equation $x^3 - ax^2 + bx - c = 0$. From Vieta's formulas: $\alpha + \beta + \gamma = a$ $\alpha\b

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$\frac{3c}{b}$

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(D) Let $\alpha, \beta, \gamma$ be the roots of the equation $x^3 - ax^2 + bx - c = 0$. From Vieta's formulas: $\alpha + \beta + \gamma = a$ $\alpha\beta + \beta\gamma + \gamma\alpha = b$ $\alpha\beta\gamma = c$ Given that $\alpha, \beta, \gamma$ are in $HP$,their reciprocals $\frac{1}{\alpha}, \frac{1}{\beta}, \frac{1}{\gamma}$ are in $AP$. The harmonic mean $(HM)$ of three numbers $\alpha, \beta, \gamma$ is defined as $HM = \frac{3}{\frac{1}{\alpha} + \frac{1}{\beta} + \frac{1}{\gamma}}$. Substituting the values: $HM = \frac{3}{\frac{\beta\gamma + \alpha\gamma + \alpha\beta}{\alpha\beta\gamma}} = \frac{3(\alpha\beta\gamma)}{\alpha\beta + \beta\gamma + \gamma\alpha} = \frac{3c}{b}$.

If the roots of the equation $x^3 - ax^2 + bx - c = 0$ are in harmonic progression $(HP)$,then the harmonic mean of the roots is

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