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

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

(a) p + q  + r = 0

(b) p2 + q2 + r2 = pr + rq

(c) p3 + q3 + r3 = 3pqr

(d) None of these

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1 Answer

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Best answer

Correct option: (a) p + q  + r = 0, (c) p3 + q3 + r3 = 3pqr

Explanation:

Given lines px + qy + r = 0,

qx + ry + p = 0

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