sample of 3 balls is to be selected at random from an urn containing 20 balls numbered 1 to 20. Six balls are green, 4 balls are white, and 10 balls are black. How many samples can be selected that contain at least 1 white ball?

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Q: got 563,320 answer choice D what I am doing wrong. I did E(X) = 0.59 x 624 + 0.41 x 476 = 563.32

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