If p ,q ,r ,s ae rational numbers and th...

If `p ,q ,r ,s` ae rational numbers and the roots of `f(x)=0` are eccentricities of a parabola and a rectangular hyperbola, where `f(x0=p x^3+q x^2+r x+s ,t h e np+q+r+s=` `p` b. `-p` c. `2p` d. `0`

A

0

B

1

C

2

D

3

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