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If three lines whose equations are y = m...

If three lines whose equations are `y = m_1x + c_1,y = m_2x + c_2` and `y= m_3x + c_3` are concurrent, then show that `m_1(c_2-c_3) + m_2(c_3-c_2)+m_3(c_1-c_2) = 0`

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A N EXCEL PUBLICATION-STRAIGHT LINES-QUESTION BANK
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