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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

`1/3`

B

`2/7`

C

`1/21`

D

`2/23`

Text Solution

Verified by Experts

The correct Answer is:
B
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