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Junior High
この場合の数の式が何故こうなるのか教えてください！
5(1)8/15【4Ｃ1×6Ｃ1/10Ｃ2】
(2)12/25【4/10×6/10+6/10×4/10】
(3)8/15【4/10×6/9+6/10×4/9】
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