The condition that the product of two ...

The condition that the product of two of the roots `x^3 +px^2 +qx +r=0` is -1 is

A

`r^2 +pr +q+1=0`

B

` q^2 +pq +q +1=0`

C

`p^2 pq +p+1=0`

D

`r^2 -pr -q +1=0`

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The correct Answer is:

A

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