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An urn contains nine balls of which ...

An urn contains nine balls of which three are ed four are blue 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)`

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The correct Answer is:
B
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MODERN PUBLICATION-MOCK TEST PAPER -II-SELECT CORRECT ANSWER
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