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The lines `px +qy+r=0, qx + ry + p =0,rx + py+q=0,` are concurrant then

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The lines `px +qy+r=0, qx + ry + p =0,rx + py+q=0,` are concurrant then
A. `p+q+r=pqr`
B. `p^(3)+q^(3)+r^(3)=3pqr`
C. `p^(2)+q^(2)+r^(2)=2(pq+qr+rp)`
D. None of these
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Correct Answer - B
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