1.

If lines px+qy+r=0,qx+ry+p=0 and rx+py+q=0 are concurrent, then the value of p+q+r is: (where p,q,r are distinct).

Answer»

If lines px+qy+r=0,qx+ry+p=0 and rx+py+q=0 are concurrent, then the value of p+q+r is: (where p,q,r are distinct).



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