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The three straight lines ax + by = c, bx + cy = a and cx + ay = b are collinear, if

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The three straight lines ax + by = c, bx + cy = a and cx + ay = b are collinear, if
  • Ab + c = a
  • Bc + a = b
  • Ca + b + c = 0
  • Da + b = c
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a + b + c = 0