[商管][統計]機率
假設有一袋子裝10顆球,4個紅5個藍1個綠,現在自袋中取三顆球,已知三顆中正好有一顆紅色被抽出條件下,抽出三色各一的機率為? 我是算1/3但坊間參考書有另一種答案,所以po上來問版上各位高手
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