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OpenStudy (anonymous):
a urn contains 7 white balls and 3 red balls. three balls are selected. in how many ways can the 3 balls be drawn if 2 balls are white?
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OpenStudy (kirbykirby):
If 2 are white, then the remaining ball must be red. So, using "choose" notation (combinations):\[ \Large {7\choose 2}{3\choose 1}\]
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