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An urn contains nine balls of which thre...

An urn contains nine balls of which three are red , four are blue and two are green. Three balls are drawn at random without replacement from the urn. The probability that the three balls have different colours is

A

`1/21`

B

`2/23`

C

`1/3`

D

`2/7`

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The correct Answer is:
D
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