Mathematics
Senior High
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この2問が分かりません
わかる方教えて下さい
[12
[714新編 数学A 5]
び方は先生4人と生徒3人がくじ引きで1列に並ぶとき、 次の確率を求めよ。
(1) 先生と生徒が交互に並ぶ確率
(両端のうち, 少なくとも一方に生徒が並ぶ確率
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