Marble Probability
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Change the number of marbles of different colors in the boxes and guess the probability of drawing a red, blue, or yellow marble. Once you have decided on your answers, click the "answers" checkboxes to see if you are right.
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Contributed by: Hyeongeun Park (February 2015)
Open content licensed under CC BY-NC-SA
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"Marble Probability"
http://demonstrations.wolfram.com/MarbleProbability/
Wolfram Demonstrations Project
Published: February 12 2015