Mathematics
Senior High
（2）の2×3がどこから出てきたか分からないです
3 赤玉が3個, 青玉が3個, 白玉が3個入っている袋から、同時に3個の玉を取り
3
(1)3種類の玉を取り出す確率を求めよ.
(2) 2種類の玉を取り出す確率を求めよ.
(2) C31x2x3-4
9C3
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