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Which one of the following conditions must  $p, q,$ and $r$ satisfy so that the following system of linear simultaneous equations has at least one solution, such that $p+ q + r \neq 0?$

  • $x+2y-3z=p$
  • $2x+6y-11z=q$
  • $x-2y+7z=r$
  1. $5p - 2q - r=0$
  2. $5p + 2q + r=0$
  3. $5p + 2q - r=0$
  4. $5p - 2q + r=0$
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