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

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