If every pair from among the equations ...

If every pair from among the equations `x^ 2 + p x + q r = 0, x^2+px+qr=0, x^2 + q x + r p = 0, x^2+qx+rp=0 `and ` x^2 + r x + p q = 0, 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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