Mathematics
Senior High
解き方教えてください!!
重要例題46 雄大
A の袋には黒斑 5 個と自玉 4 個、B の袋には黒到6 個ど自朱 4 個が入っでい
3 個玉を取り出すとき, 黒至の個数が合わせてで 2 個になる確率を求めよ。
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