The lines
$(p - q)x + (q - r)y + (r - p) = 0$
$(q - r)x + (r - p)y + (p - q) = 0$
$(r - p)x + (p - q)y + (q - r) = 0$ are

  • A
    Parallel
  • B
    Perpendicular
  • C
    Concurrent
  • D
    None of these

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