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Visitor 1550041691 posted an answer
10 months, 1 day ago

There are (5 choose 2) = 5*4/2 = 10 ways to pick 2 black balls.
There are 3 ways to pick 1 white ball.
So there are a total of 10*3 = 30 ways to pick 2 black balls and 1 white ball.
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