$A$ general wishing to draw up his $16160$ men in the form of a solid square found that he had $31$ men over. The number of men in the front row is:

  • A
    $127$
  • B
    $123$
  • C
    $137$
  • D
    $129$

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$(2 \sqrt{392}-21)+(\sqrt{8}-7)^{2}=(?)^{2}$

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