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An urn contains 9 balls , 2 of which are...

An urn contains 9 balls , 2 of which are white, 3 blue and 4 black. 3 balls are drawn at random from the urn. The chance that 2 balls will be of the same colour and the third of a different colour is:

A

`45/84`

B

`55/84`

C

`35/84`

D

`25/84`

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The correct Answer is:
B
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