Multiple choice If the roots of the equation $x^{3}-3px^{2}+3qx-r=0$ are in H.P., then the mean root is $\displaystyle \frac{3r}{q}$ $\displaystyle \frac{2r}{q}$ $\displaystyle \frac{r}{q}$ $-\displaystyle \frac{r}{q}$ Reveal answer Fill a bubble to check yourself C Correct answer