Quadratic

Submitted by alpha on Wed, 06/03/2009 - 05:40.

General questions

If every pair from among the equations $x^2+px+qr=0$ , $x^2+qx+rp=0$ and $x^2+rx+pq=0$ has a common root, then the product of three common root is
a)pqr b)2pqr c) $p^2q^2r^2$ d)none of these

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Quadratic