question_answer

If \[\beta \], \[\gamma \]and \[\delta \]are the roots of s(t)=\[{{t}^{3}}-p{{t}^{2}}+qt-r\], then \[\frac{1}{\beta \gamma }+\frac{1}{\gamma \delta }+\frac{1}{\beta \delta }\]is equal to-

A) \[\frac{r}{p}\]               

B) \[\frac{p}{r}\]

C) \[\frac{-p}{r}\]              

D) \[\frac{q}{r}\]

E) None of these