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OpenStudy (anonymous):
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 = pq+rq+rp c. p³+q³+r³ = 3pqr d. none of these
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OpenStudy (anonymous):
option C solution attached
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