If every pair of the equation x^2+px+qr=0, x^2+qx+rp=0, x^2+rx+pq=0 have a non-zero common root, then the sum of the three common roots is (1) -(p+q+r)/2 (2) (-p+q+r)/2 (3)-(p-q+r) (4)-p+q+r

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