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astranger0204
2 năm trước
Giúp em với ạ Tổ 1 cua lớp 11A gồm có 12 họ sinh trong đó có 2 bạn A và B. Chọn ra 7 học sinh thành tổ học tập. Có bao nhiêu cách chọn sao cho A và B không đồng thời có mặt trong 1 tổ học tập
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