Seven white balls and three black balls are randomly placed in a row. The probability that no two black balls are placed adjacently equals

  • [IIT 1998]
  • A

    $\frac{1}{2}$

  • B

    $\frac{7}{{15}}$

  • C

    $\frac{2}{{15}}$

  • D

    $\frac{1}{3}$

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