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In the pool, there are 8 white balls numbered 1 to 8 and 4 black balls...

In the pool, there are 8 white balls numbered 1 to 8 and 4 black balls numbered 1 to 4. We draw 3 balls without returning them to the pool. What is the probability that: (a) there is (exactly) 1 black ball among the drawn balls? (b) all drawn balls have even numbers?

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