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Three lines px+qy+r=0, qx+ry+p=0 and rx+...

Three lines `px+qy+r=0`, `qx+ry+p=0` and `rx+py+q=0` are concurrent , if

A

p+q+r=0

B

`p^2+q^2+q^2=pq+qr+rp`

C

`p^3+q^3+r^3=3pqr`

D

none of these

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A DAS GUPTA-Coordinates and Straight Lines-EXERCISE
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