✨ Best Answer ✨
ウ：1,1,3,3,4 の並べ替えより 5!/2!2!1!=30
エ：これは最高位以外は数字の小さい順に並べるだけ。
オ：311234,311243,311324,311342,311423,311432,312134
となるので オ＝イ＋ウ＋７
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