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(3) 総数ー両端が男子
7!ー4P2×2×5! 4P2…男子4人のうち2人が端
×2…両端の男子は入れ替えてもOK
5!…7人ー両端の2人
(4) ○男○男○男○男○ ○のどこかに女子が入る 4P3
4P3×4!
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