Mathematics
Senior High
赤印どう解くんですか?
ウン8U12
6先生2人と生徒8人が円形のテーブルのまわりに座るとき, 次のような座り方は何通り
あるか。
(1) 先生2人が向かい合う。
4fr20
(2先生2人が隣り合う。
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