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OpenStudy (anonymous):
Your urn contains 7 red balls, and 8 blue balls, and you draw 4 balls. In how many ways can the selection be made so that at least one of each color is drawn?
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OpenStudy (dumbcow):
15C4 - 7C4 - 8C4 = 1365 - 35 - 70 = 1260
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