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Again,one big urn with 6 white marbles, 7 black marbles, and 7 red marbles. Pull three marbles out and keep them. What's the probability that

Again,one big urn with 6 white marbles, 7 black marbles, and 7 red marbles.

Pull three marbles out and keep them.

What's the probability that at least one of them is black?

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