The arrangement of $X^{-}$ ions around $A^{+}$ ion in solid $AX$ is given in the figure. If the radius of $X^{-}$ is $250 \ pm$,the radius of $A^{+}$ is ............. $pm$.

  • A
    $104$
  • B
    $125$
  • C
    $183$
  • D
    $57$

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