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An urn has 21 balls that are identical except that 8 are white, 7 are red, and 6 are blue. What is the probability that all are white if 3 are selected randomly without replacement?
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Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?
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An urn has 21 balls that are identical except that 8 are white, 7 are red, and 6 are blue. What is t...
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