If a, b, c are the pth, qth, rth terms r...

If `a, b, c` are the `pth, qth, rth` terms respectively of an `H.P.`, then the lines `bcx + py+1=0, cax + qy+1=0 and abx+ry+1=0` (A) are concurrent (B) form a triangle (C) are parallel (D) none of these

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