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

IF every pair from the equation x^2 +px +qr =0 , x^2 +qx + rp =0 and x^2 + rx +pq =0 has a common root , them the product of three common roots is

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

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 sum of the three common roots is

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 sum of the three common roots is

If every pair from among the equations x^(2)+ax+bc = 0, x^(2)+bx+ ca = 0, x^(2)+cx+ab = 0 has a common root, then the sum of the three common roots is

If every pair from among the equations x^(2)+ax+bc = 0, x^(2)+bx+ ca = 0, x^(2)+cx+ab = 0 has a common root, then the sum of the three common roots is

If each pair of the following equations x^2+px+qr=0, x^2+qx+pr=0 and x^2+rx+pq=0 has common root, then the product of the three common roots is (A) 2pqr (B) pqr (C) -pqr (D) none of these