1.

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

Answer»

p+q+r=0
`p^(2)+q^(2)+r^(2)=pq+qr+rp`
`p^(3)+q^(3)+r^(3)=3PQR`
p+q-r=0

Answer :C


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