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

    Options :-

    1. p + q + r = 0
    2. p2 + q2 + r2 + pq + qr + rp = 0
    3. p2 + q2 + r2 + 3pqr = 0
    4. All of the above
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