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A box contains 3 orange balls, 3 green a...

A box contains 3 orange balls, 3 green and 2 blue balls. Three balls are drawn at random from the box wihout replacement. The probability of drawing 2 green balls and one blue ball is

A

`2/21`

B

`3/28`

C

`1/28`

D

`167/168`

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