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dwieriim
2 năm trước
Giải bài tập sau theo cách phần bù: Có 2 học sinh lớp A, 3 học sinh lớp B và 4 học sinh lớp C xếp thành một hàng ngang sao cho giữa hai học sinh lớp A không có học sinh nào lớp B. Hỏi có bao nhiêu cách xếp hàng như vậy? A. 80640 B. 108864 C. 145152 D. 217728
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