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A box contains 200 small rocks. Thirty of the rocks are maroon and the rest of the rocks are gold. A sample of 20 rocks

A box contains 200 small rocks. Thirty of the rocks are maroon and the rest of the rocks are gold. A sample of 20 rocks are randomly selected from the box and put in a bag separate from the box. What is the probability that 3 of the rocks in the bag are maroon

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