An urn contains $9$ balls of which $3$ are red,$4$ are blue and $2$ are green. Three balls are drawn at random from the urn. The probability that the three balls have different colours is

  • A
    $\frac{1}{14}$
  • B
    $\frac{3}{14}$
  • C
    $\frac{1}{7}$
  • D
    $\frac{2}{7}$

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